Atari Video Music - anybody have parts / lend a hand?

[pongstroid]

My AVM lost one of the brown buttons off the front . I'm hoping someone has a very dead AVM that could serve as a button donor. Anybody lend a hand? Willing to pay, but not too dearly..

 

BTW - this is the exact same AVM that Jeff Minter borrowed from me some time ago. He'd never seen one before. Have pity on it.