As if it wasn't bad enough that the worm gear can fail in Sharp MiniDisc player/recorders, there are different sizes! Update 2/26/2024 - Confirmed (ask me how I know...) that the Sharp MD-MS722 with the "G-Shock" design also has a 33mm long gearshaft like in the Sharp MD-MS721 Update 1/10/2024 - because of course there is... Yet another gearshaft size has emerged! Pictured below is a 33mm long gearshaft (probably using the same gear as the "M" or "702"-style). These were found in the Sharp MD-MS721 and the Kenwood DMC-K7R Update 12/29/2023 - This is way late, but as expected, the Large Recorder gearshaft is the same in the MD-DR77 and MD-MT770 Update 8/28/2023 - no surprise, the Kenwood DMC-J7R uses the same gear/gearshaft as the Sharp MD-MS702 Update 7/30/2023 - Fixed a Sharp MD-MS702 and it is a Large size but see this photo - you can see that the gearshaft has a different design as well with a large, flat section and a smaller plastic gear... Up...