It happen to my bs2300 too, the gap between is too big and which I cant live with it, so I try to make it myself. And now is just right.
The whole process is quite complicated and it will take you some time and effort to do it, may be an hour or two.
It is all related to the pulleys, to get access and adjust those pulleys, you have to disassemble nearly the whole player, and adjust them at the back.
If you really want to do that, I am happy to upload those photos for you and show you how to do it.