I didn't ride to work much over winter, did a few things to the bike, like make my small fibreglass top loaders fit onto the stock pannier frames, secured with just one wing nut each. Another thing I did was replace the leaking neutral light switch. Come spring and I'm back on the bike for the 40km commute...and it's getting hard to get into 1st from neutral. Must be that neutral switch I thought, but it's still the same with no switch in place. I can get 1st from 2nd, but not neutral. Not hard to ride around, but I'm a bit puzzled as to why.
A couple of weeks later I find out why - coming out of a corner in 2nd, it's 3rd, 3rd, 3rd. I suspect the pawl spring has broken, the lever is spring loaded to centre, but no gear selection. So I'm into a gearbox strip and rebuild now - I made a drive flange puller today, just need some longer 8mm x 1mm pitch bolts, hundreds of bolts at home and work, but none of that pitch.
I last rebuilt an Airhead gearbox in 1981, well before the internet and gurus making things hard.