New original Motorola crab nuts (one pair). These are the nuts under the knobs, they hold the internal switch to the housing. The two nuts are the same, and are interchangeable between the two knobs.
The nuts are not difficult to replace. To replace - the black plastic knob must be removed (pulled off) then the internal switch pulled forward (flush with the internal housing) for the nut to grab the outer threads. After the nut has grabbed the outer threads, simply screw the nut tight against the housing.
It's recommended you use a crab eye nut tool to tighten the nuts down. It will be difficult to properly tighten the nuts without this tool, so they may come loose over time.
Note: These are nuts for the Minitor 6 pager. They do fit the Minitor 7 pager, however the Minitor 7 nuts are slightly different (thinner). The original Minitor 7 nuts are not available.