I acquired a neat looking old piece of 80s vintage Sony hardware from a garage sale; a Sony Digimatic Lifetime TFM-C770W flip clock radio! However, mine was missing the special two-piece time/alarm/tune adjust knob.

Using the radio tuning knob as reference, I carefully designed and perfected this one for a firm, lifetime fit. 

Also fits the tuning knob, but inner knob will have to be trimmed and glued in place (or cut/merged in slicer). Useful if you want to inlay some foil tape for the metal shine.

Not sure how many people it'll help, but its out there now. Enjoy. 

Print:

Print STL in the orientation provided with support material. STEP file included for remixing.