Axiom Home Page Forums General Discussion Technical Questions Best way to clean vintage integrated amp?

I have a Yamaha vintage integrated amp. I opened it up, and sprayed out the dust. Someone told me to use contact cleaner on the inside and outside of all the switches and dials.

One of the switches is loose, here's a link to the inside of it (circular thing is the inside), how do I tighten this?

Anything else I should do?

http://members.arstechnica.com/subscriptors/x/saint/switchinside.jpg