I have installed 3 so far. A good set of push pins and a non marring bench block help. It has been several years now and cannot remember names for all the internal Ruger parts but there is a bar on which the top bow of the Kepplinger trigger will bear on in a rotating motion. I found if you polish some of roughness off this contact area it improves the unset trigger pull.
It is a relatively easy job, just follow the instructions.
