LeMat barrel
I understand you have the Cavalry model, and mine has a pin type barrel release, once you remove and replace the barrel a few times, you will begin to notice a "creep" on the barrel, which means once the pin or the lever is locked in place, the barrel will still move slightly left or right when touched. The creep is very slight, less than 0.5 mm and I don't think it would interfere with the alignment of the chamber with the barrel, but you can notice it.
Did you experience a similar "phenomenon"?
Thanks
Also, for the side plate, I have two small watch repair screwdrivers that would fit exactly into the side plate nut. I can turn them counterclockwise by moving my right hand up on the right screwdriver and my left one downwards, causing a counterclockwise turn, but I think that would be somoewhat of a hard work.