I also feared the uncontrollable superglue would cause the whole odometer to turn as one
I also chose to roughen the shaft where the first gear sits. I didn't use pliers, I used sidecutters to "notch" the shaft in 4 places. The gear was firm to reinstall on the shafy and I have done 3000km since the repair.
Looks like it is holding fine.

__________________
Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.