a good tool for unscrewing lenses can be made from a cheap pair of needle nose pliers...I bought a pair about 3 inches long, and ground the points to a flat point (ground the sides in - then flattened the ends a bit)

You need to be a bit careful as you can't lock them, but they've served me well in repairing lenses professionally for the last 15 years...

If you want something that locks try doing the same thing to a pair of metal calipers - the kind used in toolmaking to measure/scribe lines - you can usually find the cheap Chinese ones in stores for $5-10....

Also if you can find a old photocopier (or a friendly technician) the fuser rollers are made of rubber - once you've knocked the metal rod out of the middle you can cut them into 3 inch lengths, and then thin the ends down to the correct size (the advantage of these over commercially available ones is that you hav emore to grip, and more leverage)...

If you find a name ring won't unscrew you will need to drill 2 small holes into the name ring - you can then insert the tips of a fine pair of pliers/lens tool to unscrew them (some can be very tight).

Canon FD name rings - many of the New F1 lenses (the ones with the button to release the breech mount) have a push in lens retaining ring that is glued/clipped in - you need to put the tip of a screwdriver under the inside of the name ring to pop it out....

To remove fungus you can use many things - spit works best, then dishwashing liquid, household bleach, then alcohol - no one things works perfectly, but a combination of 2 can work well.

If you have any specific questions PM me and I'll try to help - I was a Canon Australia camera tech for 5 years, and then worked in other repair shops for a few more years....I'm lucky enough to have learn't from people who worked on Canon rangefinders, RB's and even Rectaflex's when they were new.....