Wanted:  Parts for Revox A77 reel-to-reel tape deck

I have a Revox A77 which has various parts that missing or has broken (listed below).  I'd like to replace them, the most important (to me) items are listed first.  I also wouldn't mind getting a decent quality spare tape, or two.  Please contact me if you can supply any of these parts, but I will not pay outrageous prices.

One of the spring loaded clamps that holds one of the spools in place is missing (for the small hubs, as used on the domestic tapes).
One of the speakers built into the case is open circuit. (not pictured)
One of the volume knobs is missing.
The tape-end sensing lamp is missing (the lamp near the erase head).
The power speed knob has been replaced with a poor substitute.  There's not much to grip hold of, and it doesn't have a tight grip on the shaft.

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