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  #1  
Old 11-27-2012, 05:19 PM
Oldblades
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Quick and easy screw head repair by 'Bubba'



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I was just sorting and clearing some old photos in my computer and came across these.
Forgot I had taken them, and thought I would quick throw this out if it can help anyone.

I used to deal a lot in vintage military weapons and common is the problem of a buggered screw head.
I came up with a quick and easy fix for anyone that cares.

Japanese T99 where a band screw needed attention. Purists may exit right now.



First step is to recut the slot with a file that has teeth on the edges (important). This allows you to 'saw' a new slot.



Next, chuck the screw in a cordless drill or drill press. A piece of sandpaper is laid on a towel, using whatever grit will give the correct metal finish. Fold it as many times as necessary to be able to put some slight pressure down so the sandpaper will 'wrap' around the screw head at the desired depth. Flat head- no towel / oval head- a couple folds / round head - more folds etc.




This one came out pretty good




Cold blue of choice. This crap was evidently all I had on hand.




Voila! Maybe this will help someone.

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  #2  
Old 11-27-2012, 05:22 PM
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This one came out pretty good.
It sure did! Thanks for that.
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Old 11-27-2012, 07:30 PM
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Anyone who buys used guns will run across screws that were turned with a tapered screwdriver. I like the trick with the towel/sandpaper
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Old 11-27-2012, 07:53 PM
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This is why I joined this forum. Knowledge. Thanks Oldblades. Matt
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  #5  
Old 11-27-2012, 09:09 PM
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You can start by hammering down the high spots first, it will save you some sanding time.
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Old 11-27-2012, 09:46 PM
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Peening the burrs on the head saves metal on the screw head- And use the thinnest file you can get .
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Old 11-27-2012, 10:12 PM
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Quote:
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You can start by hammering down the high spots first, it will save you some sanding time.
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Peening the burrs on the head saves metal on the screw head
Busted! Thanks guys. I forgot to mention that part.
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Old 11-27-2012, 10:19 PM
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Good tips--been doing it for years myself--I usually go to 600 grit paper to polish before the cold blue.
One more tip if you have a REALLY small screw with a very narrow slot and you can't find a thin enough file or don't have one on hand.

Get the thinnest or appropriately thin Dremel diamond wheel and hold it in a pair of vice grips to recut the slot. It will be slow going, but works well. If you want to make it a little easier, break the diamond wheel in half and you will have a flat surface to file with, rather than a round edge of the wheel. IE, you're using the diamond dremel wheel as a very thin file.

DO RESIST using the diamond wheel in the actual dremel with the motor running. 90% chance either you will slip and it will catch and chatter, or the screw will move in the vice, or if too tight the vice will mash the threads, or it will catch and the screw will go flying in to that corner of your workshop area known as "The Twilight Zone", or you'll cut the slot just a little off either on one plane or another or cut it too deep UNLESS you have extra screws around to play with.
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Old 11-27-2012, 10:41 PM
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I think that it turned out awesome. Nice save.
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  #10  
Old 11-28-2012, 08:45 PM
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Nice work, this will be helpful.
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  #11  
Old 11-29-2012, 08:16 PM
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I like to heat the screw head to the desired blue and quench in cooking oil.
Oil from an empty tin of sardines also works great but should be done outside.
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Old 11-29-2012, 08:31 PM
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I like to heat the screw head to the desired blue and quench in cooking oil.
Oil from an empty tin of sardines also works great but should be done outside.
In the winter when they're no skunks around, IMA.
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  #13  
Old 11-30-2012, 07:22 AM
Don Stith

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If you get an older gun, like 1850's, the screw slots are tapered. A knife edge file is needed for them
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Old 11-30-2012, 08:55 AM
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A piece of leather with the sandpaper on top also works to press into, it has enough give to work.
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Old 12-01-2012, 07:20 PM
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Thumbs up

Excellent post. That's the kind of information that led me to this forum.

Last edited by Papa Tango; 12-01-2012 at 07:21 PM. Reason: incorrect punctuation
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