New gun to me, good mechanics and good bore. .44 Russian caliber. Want to clean up the lock work, does the screw in the middle of the side plate holding the side plate on the gun? Any hints on disassembly would be appreciated .
Yes, the Screw you mention holds the Side Plate in place.
This screw can be quite tight, and one has to have proper 'perfect' fit, hollow ground Gunsmith Screwdrivers to remove or install it.
Once the Screw is out, remove the Stocks, support the Barrel Cylinder and lower Frame Group ( or remove the Cylinder and support the Barrel and lower Frame group ) in one Hand, and lightly tap the bare Grip Frame with a small plastic Mallet or an elongate Wood block, and allow inertia to 'walk' the Side plate up and out.
The Side Plate is thick, and fits snugly, and one must never pry it up at any point, only allow inertia to walk it up from lightly tapping the bare Grip Frame while firmly supporting the rest of the Revolver in the other Hand, and let inertia walk it out so it can be lifted away with the fingers.
Mechanism requires special Punches and Tools and Spring Clamps and one best not mess with it beyond spraying in some Aerosol Brake Cleaner or Electrical Contact Cleaner to dissolve away old tired or oxidized or gummy Lube, let dry well, and apply fresh appropriate kind of Oil.
Side Plate is installed by careful alignment and pressing it in with your fingers....once all the way in, the Screw may be put back.
The Screw must not be used to try and achieve full depth of fit...as full depth of fit of the Side Plate needs to be done by evenly pressing it all the way back in with your Fingers...so the Screw merely hold is in place, for it already being all the way "in" place.
These are a whole other Ballgame from the Mechanisms of the later N Frames...even if Side Plate Logic is the same.