As others have said these BSR decks were cheap and cheerful it's probably always been like that. I had one that ran too fast on 33 it was a build up of rubber on the motor pully , just a tiny ring but it was enough. I always run the motor and apply a little emery paper to the pully just to be sure.
Otherwise as it has been suggested try taking a little off the pully , or try another motor if you have one?
Customers can be really unreasonable, I sold a Dansette to someone who "really wanted one" I advised them in advance that they were cheap and cheerful , not hi fi just aimed at teenagers wanting to play pop music. That was accepted until the player arrived then we had all sorts of "problems". suspect wow and flutter... on Opera music..? The main problem was background hum during quiet passages of music... I had it back to check it over, the hum was negligible in fact low for a Dansette. I just took it back and sold it to someone who liked Elvis...
