I purchased my JVC-M90 back in 2014 for 1100 bucks. The tape deck was flaky however. it worked OK for a while. But then to get it to start again, you had to plug and unplug the boombox.. I had my friend service it and replaced the belts with the proper ones. It’s still had the same problem. He said that one of the plastic gears was wearing out. Because I know every time you turn on. The boombox. It goes through a cycle. With the tape deck. That probably prematurely, wears out the plastic gear. The problem is it’s impossible to get parts now. One would have to find a M90 but with the functioning tape deck. That might have a blown amplifier, but the tape deck part would be OK then take the good working deck and put it into the unit with the deck that needs replacement. If it’s a gear, a plastic gear, maybe with 3-D printing you could make a new one. Not sure about that. Any thoughts or ideas?