I recently fired up three old laserdisc players that I hadn't used in a long time. They are are all Pioneer (CLD703, CLD503, CLD702). They each started alright, but made horrible "screeching" and "grinding" noises when changing sides or when the disc would spin down upon ejecting. They all worked fine previously. I figure there must be a part that needs lubricating, as these players hadn't been used in about two years. I don't see how they'd all coincidentally develop the same problem, so I assume there must be a track or bearings of some kind that have dried up. I don't want to play any more discs until I figure out the problem. I noticed slight ring wear on the discs' labels near the center hole. There must be some slippage occuring in the players' clamping mechanism that is causing this wear. I was hoping someone might have some knowledge as to what I should be looking for when I open the players up for inspection, and what, if any, solution I might try. Thanks in advance!