Sony Walkman WM-DD33 and WM-D3 Professional + National Panasonic RN-Z500 Microcassette Radio

WM-DD33
https://www.ebay.com/itm/184220585262
WM-D3
https://www.ebay.com/itm/184220592560

Both working, with solved center gear problems.
The WM-DD33 has a fixed center gear, still clicks but it all runs smoothly, with 0.148% RMS wow and flutter (service manual specifies 0.14%)
The WM-D3 has a new center gear, runs nicely on play and FF, but makes a grinding noise on rewind, I haven't been able to solve that problem, but it doesn't affect the operation.

Very rare European National Panasonic RN-Z500:
https://www.ebay.com/itm/184223058570
Fully working.