Fortunately I retrieved my 1986 TDK MA-XG 90 cassette before it twisted inside the transport mechanism following a brief take up spool failure. Then the locking pin flew off along with the spring and toothed gear wheel and travelled across the floor. After half an hour of hands and knees and torch searching all 3 components were reunited. Then I noticed the split inside mounting shaft. Almost identical to this one I found on an old Tape Heads post. Image attached. I think only a 3D printed solution will resolve this problem but for now a minimal and deft use of Loctite has everything working again and no tape despooling evident and REW now works again.
Nice fix, Silvera. I had the same sort of issue with an SK-909 boombox. A shrinking plastic (rewind) gear around a steel axle, causing the gear to crack. It looks like the same kind of plastic. Exactly the same color. The only solution is actually a replacement. But I also temporarily solved it with glue. Fortunately, it's been working fine for a long time now. Although I use rewind as little as possible.
That's a good point. As REW did not work at all before this little hack I did with the loctite I'm inclined to think that REW puts pressure on that part. Until I can get the 3D part proofed and reliable I might avoid hitting that REW button. It's a relief to put in a Sony Metal Master tape without wondering if it's going to spool off and spill inside the transport mechanism.
I just moved my CT-F750 to the top shelf and took a quick look, the part your showing is normally covered by the hub? I don't know how similar the transports are but the back plate and hub area look identical. I can't tell, is the 1000 soft touch?
Yes it is soft touch. I expect there would be similar parts used in a number of Pioneer decks from the 1970's and without removing the center pin, spring and gear you cannot see if that part is split or not but if your take up spool stops or REW fails but FF is OK it's probably and indication that the plastic shaft is split. If you are removing the locking pin be super careful because that spring tension is sufficient to fire the assembly across the floor and you're in for a great time crawling under furniture etc to find the bits and reassemble.
