Awesome to see people repairing these awesome pieces of vintage Tek gear! I'm somewhat new to the field of electrical engineering/"small" electronics myself and I have already decided I am going to collect/repair/rebuild vintage analog gear - mostly Tek stuff. Anyway..
The first scope I got was a 465 on a trade for dirt cheap. It didn't work properly - at all - at first, but after taking it apart and cleaning it multiple times and a couple other small adjustments, I was able to get it working perfectly. My most recent purchase was a 468 that "couldn't read a signal". Same deal there - needed a real cleaning. I had to clean the drums and finger switch contacts multiple times to get it working well again ( on both scopes ) - but managed to get them squeaky clean with beautiful traces.
Tombi - This may help you -and others- clean the drum switches entirely and get it back to functioning beautifully again: Using DeOxit D5, Isopropyl Alcohol 91%, Camel hair (cheap artist) paint brushes, and a spray bottle:
First blasted the drums and finger switches with the DeOxit to loosen up the film/oxidation. Next took the camel hair brush and, keeping it very wet by dipping it in alcohol to soak/rinse, I really brushed the drum - repeatedly - (changing the alcohol as it filled with dirt). After each once-over I hosed it down with the spray bottle of alcohol.
For the finger switches - take a small camel hair brush, and using the same soak/rinse method with the brush, rotate the drum to get each switch opened up and gently slide the bristles between the fingers and board. If you feel it to be necessary, (and brush is thin enough) you can close the switch on the bristles and gently pull the brush out. I would only do this if the regular method failed after a few good cleaning cycles.
silverlego3 - if you aren't able to bend the rod back gently until you can get it functioning again, you will easily be able to find a replacement attenuator assembly from ebay or one of several parts sites. Definitely shop around a good bit, though, since lots of people like to charge ridiculous prices for parts. Definitely salvage as much as you can, and keep whatever parts you replace. They may be useful in the future! There are loads of people that are far more educated with this stuff than myself, but I don't mind helping out with as much as I can.