Hi Lawrence

I've fitted a good number of Thacker belt kits to Marantz high-end CD players - there should be a very full thread on AOS to which I contributed some time two year ago. It's intricate work but not impossible. The one thing you must deal with is the tensioned wire drive which has to come off to allow access to one of the belts. Don't attempt this unless you have a very certain method of stopping the wire unravelling. That and the frustration of dropping tiny circlips into the heart of the machine...

You'd do well to check the foam bump stops and the foams on the clamp as these will have aged badly I guess. The mechanism sled can get badly fouled by degraded plastics foam so check the runners.

PM me if you want a one to one.
DGP