What tooling does the S&W factory use to install sights on their pistols?
don't know what do they use but I use MGW works great. I had replaced 4 sights in total without issues.
Here's another link to a tool that is a lot less expensive and much more universal:
http://smith-wessonforum.com/access...-ruger-beretta-revolver-plugs-mk-v-added.html