For years, I've had this problem on my otherwise restored BeoCord, well-known as one of the best ever made by B&O. It had a single remaining problem, where the FF or RW would operate intermittently, rotate for a few rounds, and then stop.

Drove me crazy. 

Martin supplied me with new belts, but this was not the solution for this particular problem.

It was quite obviously the main idler tire, which had worn smooth (and inflexible), and so it was not making good contact with the metal idler wheel.

Over this time, I tried many solutions, including shaving off a thin layer of the hard rubber, using Rubber Renewer, attaching a layer of electrical tape onto the rubber idler, and many other creative solutions.

Nothing worked satisfactorily.

I tried many rubber washers, also no success.

This week I received a Konig Electronic idler tire 1042.01 - not an exact size replacement (with a slightly larger diameter), but it does a damn fine job of getting the FF and RW working perfectly again.

It's the upper tire in the picture.

So, this can go into our database as an admirable replacement for the original.

Menahem

Thanks for sharing this my friend!

I too have a superb, as new, Beocord 2200. No such problem but...