Flattened Detent ball for flipper

I usually go with a 1/16 bearing and leave it protruding .024-.026 and drill the hole in my blade with a #54 drill bit.
Make sure your blade is perfectly flat and parallel and buff the tang of your blade (where your bearing rides) with a cotton buff and some white compound to smooth out the surface a bit. Flattening the bearing a little will help make your action a little crisper because you won't have to over ride the force of your lockbar over the .020 or so of your bearing height. (hope that makes sense). If you do flatten your bearing a bit be sure to buff it smooth afterwards. I use a little leather disc on a dremel tool with a little green chrome rouge. This with the polished and lightly greased bearing track will ensure a smooth and silky action with a crisp release. Be sure to use a soft light grease on the bearing track and in the detent hole for added slip.

If you are using the IKBS system or similar, be sure to break it in and burnish your action. I do this simply by assembling the knife and making sure the blade is centered and then tighten the pivot. Once snug, tighten a bit more and cycle your action 50-100 times tighten some more and repeat 2-4 times until when you back the tension off of your pivot the action is smooth and lump free. If you apply to much tension to soon you can dimple the race, go a little at a time. Once your action is perfect dis assemble and clean up everything. You'll see that your grease is black, clean it all up with q tips and acetone and replace with new grease and new bearings. I throw away the old bearings. Your folder should be awesome at this point.

Aloha!
 
A simple system to quickly set your bearing to the proper depth. Drill the bearing hole with a # 53 drill . Take an old reamer or piece of 3/16-1/4 round stock or whatever is handy and chuck it in your lathe. Use a 1/16 ball nose endmill and drill into the end of the rod .024-.026 deep. Magnetize the end by rubbing it with an old magnet and use it to press in your bearings. Works great every time and lasts forever.
 
Funny that I was flipping my Leek right when the expert chimed in! This thread has a lot of good info, really want to try out some of the things mentioned since right now my folders are still regular liner locks pretending to be flippers.
 
Thanks Ken and everybody that contributed. I'm working on a drawing right now for a frame lock, and this was one of the things I wanted to get sorted before I moved on to metal with the design.
 
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