VHS Cassette Manual Rewinder
I had a VHS cassette that my VCR would not fully rewind because the tape made too much friction before all the tape was back on the supply reel. Manually crank it with the device to finish the job. The device minimizes the friction by engaging the reel sprockets at their specified locations, centers the reels for minimum friction, and its ball bearings keep the action smooth.
You need quantity two 636ZZ bearings, quantity two screws M3x25 (or #6 x 1 inch--either size works)
Quantity one M3x12 screw (or #6 x 1/2 inch).
All the screws can be either socket head or pan head.
The screws self-thread into the plastic, which is why M3 and #6 are interchangeable here, but in either case, go easy on the torque. The metal screw will strip out the plastic if you torque the screw enough.
Each 25mm screw holds a socket to its handle. I put the 50mm length handle on the supply reel, and the 30mm handle on the takeup reel. Turn the supply reel clockwise to rewind.
The 12mm screw engages the reel brake release inside the cassette. Don't omit it, nor substitute a different length! The reels won't turn.
Print quantity two of the socket.stl
I printed in Prusament PLA Jet Black.
Supports ON makes the screw head countersinks prettier.
I used FreeCAD. The VHS Cassette dimensions for the 3D model are from the SMPTE 317M-1999 standard.
FreeCAD apparently does not have a way to link the 30mm handle object to the 50mm version, so you have to manually change the spreadsheet in FreeCAD between 30mm and 50mm to generate the two different length handles.