Vintage Rek o Kut, GATES, GRAY,RUSSCO turntable rebuilds ??


I am thinking of rebuilding some old transcription style turntables for use with mostly old mono records, maybe some 78's,   I'm interested in what some peoples methods are and the quality of some parts like idles and replacement parts......I would like to hear from people that have actually done the work, not somebody who has nothing constructive to offer ..............THANKS
autospec
Do any of you know the difference between a CB-500 and a CB-100 Gates other than the year ??      
https://www.vinylengine.com/library/gates.shtml

I didn't read it , but there seemed to be a lot of info on the
Gates CB 11-500. I'll give it the once over..

Regards

Hello, I know this is an old post,but I need an Idler rim/rubber replacement,mine is out of round it works but makes annoying sound,any help please to buy one.Thank you