Hi
I experienced this type of problem with a rockola 432 and rockola 434, apart from tightening up the basket motor, the only way i could solve it was a combination of adjusting the read out arm and slightly bending the record slots, there's a bit of play in them but be careful they could snap, i had to go through the basket several times before i got it fully right. There's a good bit of tolerance when the gripper arm picks the record up but less when its returned.
regards
clones