Hello, I purchased a used MD unit on eBay, a nice M-100, however the overwrite head was bending on disc insertion. I didn't realize this, and now the unit is worse off. First of all, what would have caused that? I read somewhere that there is a DC motor for the eject mechanism that raises the head, is this true? The seller claimed he only used the 3v mains adapter for recordings, as the battery does not charge. Not sure if prematurely removing power was the culprit. I also found a tiny piece of MD case inside the unit (it fell out when I was inspecting the head) so maybe that was the cause. I'm frustrated. I really wanted this unit in my collection. The seller has agreed to a refund, which was kind. I just want to see if anyone has a remedy for the overwrite head, maybe we can help the seller fix the issue. I read a lot on the forums, but there isn't much about overwrite heads and the ribbon cables bending the heads down too far. Thanks!