I used some of the info I got from an article on the Winchester/Miroku 1892 hammer and trigger mods by SAAJim (that also works for the modern Miroku '86's http://web.tampabay.rr.com/jimstags/win1892/index.htm and from other members on the www.leverguns.com board about modifying the rebounding hammer on the Winchester/Miroku 1886's. Also from the thread on Winchester/Miroku 1886 misfires http://leverguns.sixgunner.com/topic...55&whichpage=1 I have been getting misfires from light primer strikes and it was time to castrate the rebounding hammer and fix the terrible trigger pull. This fix does wonders for the action and makes it run much smoother. It is always easier for me to see pictures or watch something being done than just reading about it. This is why I have done this tutorial. Hopefully this will help some of you Miroku 86 owners out.
P.S. This is what I done to MY rifle and it works fine. Your may be different. It is best to go slow. If you happen to screw it up, its your fault and not mine!
On to the hammer modification.[]
STEP ONE:
Remove the upper and lower tang screws and pull buttstock off. The upper tang screw goes all the way through and screws in the bottom tang. The lower tang screw is a wood screw.
With the buttstock removed you can see the Hammer Strut and mainspring. The culprit is the lower leg of the Hammer Strut pushing against the the hammer causing it to rebound or bounce back.
STEP TWO:
With the action closed pull hammer to rear and remove the receiver (hammer) screw. You may want to captivate the mainspring before removing the receiver (hammer) screw. This coil mainspring is strong and may fly to the next room if not held in place. You can use a paper clip or similar item to hold the mainspring in place.
STEP THREE:
After removing the receiver (hammer) screw, open the lever and pull the lower tang straight back out of the receiver. At this time the hammer will drop out as well. Pictured below is the hammer and lower tang assembly.
Take the mainspring off the hammer strut.(Be careful, as this spring is strong and under tension)