I talked to a guy that does 7900A repair today. He said from what I described that the heads are probably just in need of strong cleaning with a toothbrush, then touchup with 100% alcohol. As long as the gimbal isn't bent, all should be well. That takes care of the heads. Then you wrote... He also said the platter scapes make the platter almost, but not quite, useless; and that I definitely need a new platter. The lower platter on the 7900A does in fact seat on a machined area of the spindle and doesn't need special centering - "just bolt it on? - just bolt it on". He said I could use any 14" disk media that was the right thickness. Can't remember if it was 50 mils or 75 mils. I think it's the same as the RK05. I'll find out the mils number tonight when I compare my 7900 cartridge with my 7905/6 one. All I need to do is clamp a metal micrometer on the platter <just kidding folks!>. So - does anyone have a broken RK05 type cartridge that they'd part with so I can steal the platter out of it? True, but if there is so much scraped oxide that the badtrack list is 10% of the platter, why even bother. I've been quoted anywhere from $50.00 to $250.00 for a media only surface (no hub, which is all I need). Hopefully someone here can help out? Thanks in advance!!! Jay West