Hi Bunk
Here is how it works. Closing the lever, the lever face "taps" the top rear of the Carrier Block Arm. Lever side spring powers it down. If
the front face of the Carrier Block, and or the Mortice become fouled with powder residue (matters not, BP or Smokeless) the carrier WILL
stick about halfway down. Rifle is jammed solid.
With Positive Slam Down, the lever face stays in positive contact with the carrier blog arm ALL THE WAY down, driving it through the
gunk. With positive slam down, the only purpose the side spring serves is to hold the carrier "up" while the bolt strips a round.
At the top rear of the carrier arm, a hole the correct size for an 8-32 set screw is drilled ALL the through the arm. Then the hole is tapped
with 8-32 threads. The set screw is installed with the socket DOWN and the end at the rear flat of the arm is dressed flat. The set screw
is then adjusted so with the lever against the loser tang, there is the tiniest movement. More what you can feel rather than what you can see. Then you remove the screw, hit it with a drop of BLUE LocTite, put it back in, adjust it properly and let set for a couple of hours.
Following this modification, the lever pushes the carrier all the way through it's travel. Can't jam.
If you don't follow this, let me know and I can either send you a photograph.... or ..... I'll send you a modified arm .. exchange.
Be sure and change out both of the lever side springs. Your rifle will love you for it. Plus, if you wear out the little cam on the lever, you
can no longer replace the little cam. You have to buy the whole lever (sux).
Coffinmaker
PS: Forgot. This modification applies to any Toggle Link action. Henry, '66, '73 .... all of them