So, does a C&S hammer and sear lever replacement require modification of your HP?

From Cylinder & Slide:
"It is very wise in the BHP, that if you are going to change the hammer that you always change the sear,this way you will have a match set made of the very best materials,and will last a life time.

What you are also talking about is the improved sear lever. This has to have a different hole drilled in the slide to make it work like it should. This new sear lever changes the geometry of the angle, and will result in a better trigger pull weight. This hole has to be made on a milling machine as it has to be in the right place."