The CRT convergence is probably out slightly from the rings being loose from the glue going bad, or being moved during the disasembly. You can probably fix it, but it is very tedious work (you will also need to have the Mac running with a test pattern) and you'll probably have to remove the hot glue you recently applied, assuming this is around the yoke. If it's not too bad, I'd just leave it.

My current home project has been restoring an early 80's LAI arcade cocktail cabinet, and have kept the CRT (but with new monitor chassis), and also having to adjust the convergence rings as they were loose as anything from a rough past! It's not a fun job adjusting these (wear rubber gloves!!!), but I've learnt a heap during this project. I'm proud that I didn't resort to using an LCD in the end.

Hi Angelica

JB