I have a chance to buy a nice-condition S&W Mod 65 .357 but it is missing one screw from the side plate and the cylinder release. I am curious about: 1. How difficult it is to purchase the necessary part(s) and 2. Ho difficlult is it to install them safely? I am not a gunsmith, but am pretty familiar with semiautios, although I've never broken them down for more than cleaning. Can anyone offer any insight? The gun is being offered for $235 as-is in nice condition. Thanks.