[With the aid of an ex-mechanic friend...]
I was trying to put a new bottom bracket in the bike formerly known as
singlespeed, more recently known as
dinglespeed and now known as
6-er. It has English threading. I remember that as '
right is wrong, but left is right' but I made a mistake... The fixed cup was labelled '
LH' and I took that to mean lefthand, as in lefthand side of the bike! I managed to get it started that way using fairly gentle finger pressure, not using tools. I then tried to start the loose cup on the righthand side of the bike. It wasn't having it! I didn't make the mistake of trying to force it in but was rather baffled by its refusal to cooperate...
Ex-mechanic pal arrived... He looked at what I was doing and told me that I was putting the BB in the wrong way round! I asked if he was sure and he said that he has done thousands of them in his time, so yes. But the BB fixed side was marked LH! Er, yes, as in lefthand
thread NOT
lefthand side of bike! Aaargh, what an unfortunate ambiguity!
We started again, and sure enough, it went in cleanly the other way round. What neither of us can work out is how I started it the wrong way round with only finger pressure and without damaging the thread!
Anyway - no harm done. The bike has been reassembled and is ready for a test ride this evening if it stays dry.