http://ebay.us/5XtyL7?cmpnId=5338273189 The previous buyer broke it and lied to get a refund. It's now fixed and works well again, you can check it out in the video in the description of the auction.
The clutch half-exploded (maybe during shipping?) and the mechanism was slipping, so the Walkman was eating the tape. I solved that for good now and there should be absolutely no issues with it.
Mostly, I didn't have any 330uF ceramic SMD caps so I left those two out, probably the cause of lower volume.