Going thru a 2000A currently. The bass pot had an issue with not turning thru the full rotation range. Pulled it out and disassembled it last night and the plastic stop collar in the rear is broken. I’ve been looking at used ones on eBay and am wondering if anyone can tell me if other units (2000, 3000, etc) used the same pot? There are several on there from 3000’s and 4000’s that look the same, but I’m not sure if the shaft lengths varied series to series?