[John Lawson]

Do not touch that tensioning screw. It will reduce, by orders of magnitude, the ability to successfully strike a primer and fire the revolver.
The Wolff kits are easy to install, especially if you have bought a copy of Kuhnhausen's book on S&W revolvers. Always use the proper screwdriver, and make sure the tip is not too long. Tap the sideplate with the plastic handle of your screwdriver, not a metal instrument. Be very careful in replacing the sideplate. Set the parts in proper relationship, hook the top protrusion under and slowly and carefully lower the sideplate into place. Never force or pound it into position.
A careful person can do the modification as well as a gunsmith.