Hi, i have a 1984 fisher studio standard cd

hi, i have a 1984 fisher studio standard cd player. when it plays, it sounds excellent and works fine. the machine will play cdr's as well as normal cds. however, some cds it simply will not spin. it clicks three times slowly, and then does nothing. i figured out a trick that works 100% of the time: tilting the entire machine at a 45 degree angle will get the disk to spin, i can then return the machine to its normal, level position and it plays fine.

there seems to be no rhyme or reason to the disks it will and won't play. in fact, when i was comparing the sound quality of this cd player to a newer dvd/cd player (no difference in sound quality by the way) i was using two identical cds, and yet the fisher would only play one of them. interestingly as well, once the fisher starts playing, it deals with bad cds quite well and does not skip. it's just an issue of getting it started. i opened the machine in the hope of finding one 'pot' that i could turn up, but instead found 6 adjustable metal squares. i fiddled with them, but it made no difference, and i returned them to the original position. i also cleaned the laser while i was in there, which made no difference.

please help!