Apart from the potentiometers, the relay is a weak point.
That relay switches in a special way and is no longer available. There is no substitute for it.
I have composed an alternative relay from a small SMD relay on a converter board. This will replace the original relay. That works like a rocket. It is not guaranteed that it is the solution, because of course I cannot see remotely what has happened to it.
But if you have not ordered a good string and, as Dillen has pointed out, there is one that has been bought through eBay, then you probably have a much too tight string that prevents the table from getting up to speed.
The engine can also be the cause and sometimes it has to break up.
