Re: Using a grommet as a gear !
Good repair if you are stuck on a space ship or on moon base alpha with no spares and very few tools, the ingenuity might save the day.
Many tuning mechanisms that have gears rather than some sort of friction drive did it because the vanes of the variable capacitor required to have some fixed registration with the tuning dial-knob or tuning pointer (I'm not sure if this is so in your radio). In these cases it is necessary to replace or re-manufacture the missing gear if the dial-station pointer system is to work properly.
Old clocks, electric or mechanical, can be a good source of small gear wheels to jimmy up a repair, if a gear set is required. In the days of watch & clock making the local repairer would machine one up for a good price, but those days appear long gone.
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