medicman,
What The Shootist is telling you to do is basically the same thing that happens when the gun fires a real round.
Without your finger on the trigger, push the hammer as far down as you can.
Release it so it pops up by itself. A safe gun should not let the hammer go.
Try it a lot of times.
I worked on my trigger and got it down to 5 lbs (from 8) and it shot nice.
Took it down to 2 lbs and then tok it to the range.
When cycling the action by hand the hammer would rest fine but when the cartridge cycled it the whole mechanism went too fast for the hammer to catch onto the sear.
The result was a bullet fired, shell ejected, hammer cocked but then slipped back into the fired position, and a new cartridge was striped from the magazine and chambered.
I pulled the trigger again and of course nothing happend.
On 3 occasions the gun fired two rounds with one trigger pull.
Luckily the rangemaster was a gunsmith and it took us about 30 minutes but he helped me figure out what was wrong.
You're especially run into this problem while changing the hammer's engagement angle too much.
Hope that helped
If you have a good knife sharpening stone that will work even better than sandpaper because it won't round the edges like sandpaper might do.
i started off with 320 grit paper glued to glass then used a medium stone. I polished it with a 3000 grit ceramic stone.