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  #76  
Old 08-09-2010, 07:03 PM
grantj

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That is easy Pete....just put a little of the Gun Glide on there that i added when i bought your springs!
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  #77  
Old 08-10-2010, 09:20 AM
sakopete
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Gun Glide is good stuff. Jim and I both not only use it on all our choke tubes and bearing surfaces on our shotguns, but on every rifle bolt we own and of course all our screws. We have never found a better grease and we have tried them all.
Pete
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  #78  
Old 08-10-2010, 09:51 AM
varmit hunter67
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I received my jnp action screws and trigger spring Friday in the mail and installed them Friday night. I used some jewler's white rouge to hand polish the firing pin a little on the out bearing surfaces. My dremel tool went south on me, and I haven't gotten another yet.

I noticed a definitely audible, as well as "strike" improvement from the new spring. I went to the range Saturday morning and put my Silhouette through its paces with the new spring. It was a definite improvement. At 25 yards I was about a ring or ring and a half low the 50 BR target, so I think I am probably dead zero at about 35 yd.s. I never moved my target stand out to 50 yards, but I can say I was cutting leaves off a Va. Creeper vine on the back berm at 70 yards. It was shooting so good, I never said anything to anybody because they would have thought I was trying to blow smoke at them. It was really a perfect morning to shoot. High humidity, no wind and overcast. VH

KUDOS on the JnP springs!
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  #79  
Old 12-22-2010, 08:34 AM
2kbill
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Here's to better groups!

On right is with the as-received spring, about 25% failure to fires.
On left is with known-good stock CZ452 spring swapped into the Brno Model 4.



Accuracy did improve with the newer spring. I have another spring on order from Pete.
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  #80  
Old 12-22-2010, 06:06 PM
sakopete
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Thanks guys. All the credit for that spring, and all the rest of the ones we have, goes to my brother Jim. He and our spring engineer spent a lot of time and dumped a lot of springs in the trash until they had it just right. (he is also the one that grinds every one by hand)
Merry Christmas,
Pete
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  #81  
Old 12-22-2010, 09:18 PM
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I have always understood that if you lubricate threads the torque values change. To obtain a torque value of 20-22 in-lbs on the bolt you only torque to about half with a lubricated bolt.
If you are interested in getting the most accurate torque, you need to have everything clean and dry.
Torquing a lubricated bolt to 20 to 22 inch-lbs will actually result in a much higher actual torque or stretch on the bolt than anticipated.
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  #82  
Old 12-23-2010, 05:32 AM
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Quote:
Originally Posted by chezrad View Post
I have always understood that if you lubricate threads the torque values change. To obtain a torque value of 20-22 in-lbs on the bolt you only torque to about half with a lubricated bolt.
If you are interested in getting the most accurate torque, you need to have everything clean and dry.
Torquing a lubricated bolt to 20 to 22 inch-lbs will actually result in a much higher actual torque or stretch on the bolt than anticipated.
Welcome to the ward, what you're saying is counter to what I've been told by several gunsmiths.
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  #83  
Old 12-23-2010, 06:09 AM
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My CZ453 will misfire every so often. When I look at the firing pin strike, it looks fine. I ordered one of these J&P springs to see if this resolves my issue......
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  #84  
Old 12-23-2010, 06:23 AM
sakopete
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Quote:
Originally Posted by gmd1950 View Post
Welcome to the ward, what you're saying is counter to what I've been told by several gunsmiths.
We recommend lubrication on all our action screws. On the threads and under the head.
Pete
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  #85  
Old 12-23-2010, 06:32 AM
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Originally Posted by sakopete View Post
We recommend lubrication on all our action screws. On the threads and under the head.
Pete
Yep, you and Jim told me that and I've asked three other gunsmiths and they all agree with you.
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  #86  
Old 12-23-2010, 09:02 AM
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Welcome to the ward, what you're saying is counter to what I've been told by several gunsmiths.
Several things can affect torque settings.

If the fasteners are lubricated, or if you use an extension on the torque wrench come to mind. There is published data in the public domain covering this.
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  #87  
Old 12-23-2010, 10:33 AM
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Even I can do it

I installed the J&P spring on faith alone, never having fired my new rifle. It is an extremely simple process that even I could do. There is a great photo series on FLIKR as well as an English gentleman who has a nice video on youtube. As my computer was stolen, I'm sorry I dont have links. Dont be afraid to do this yourself. Just remember you must hold the trigger to remove and insert the bolt.
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  #88  
Old 12-23-2010, 10:43 AM
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Chezrad, a torque driver measures torque. It does not know if the screw is lubricated or not. Lubricating to prevent galling should give more consistent torquing.
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  #89  
Old 12-23-2010, 11:27 AM
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Quote:
Originally Posted by chezrad View Post
I have always understood that if you lubricate threads the torque values change. To obtain a torque value of 20-22 in-lbs on the bolt you only torque to about half with a lubricated bolt.
If you are interested in getting the most accurate torque, you need to have everything clean and dry.
Torquing a lubricated bolt to 20 to 22 inch-lbs will actually result in a much higher actual torque or stretch on the bolt than anticipated.
In all my manuals I use to fix my German-made cars, all torque specifications are for oiled threads, including for the wheel bolts. In some special instances the quality and type of lubricant is listed too.
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  #90  
Old 12-23-2010, 11:40 AM
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Quote:
Chezrad, a torque driver measures torque. It does not know if the screw is lubricated or not. Lubricating to prevent galling should give more consistent torquing.
Actually the torque wrench does know if the screw is lubed or not.

It uses the same principe that a Thermos bottle does to know whether to keep food hot or cold.

I like physics..............it's quantum physics that confuses me.
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