I found this yesterday- I thought it was useful and may help others. It's by Johnny Butten and he strips down and rebuilds a Recording King RK-75 Elite.
http://www.youtube.com/watch?v=B9SG_uyyKvc&feature=context&context=C3a24ddfUDOEgsToPDskLMvT52h1mQRCnO4txTxttj
Dylan