is an older Shimano compact double square taper crankset (maybe 105?) still something that is made?
Even Claris has gone to HT2 now, so you'd be delving into some alarmingly shit OEM groups to find a Shimano square taper road crank, e.g. Tourney FC-A070
or the slightly less revolting non-series FC-RS200 which is no more expensive than Tourney
Right. Well, it’s an old bike. What would you think is the best solution to the pedal threads getting stripped on one of the cranks (drive side, irritatingly)?
PS It’s not my bike, hence being a bit vague - trying to help out a non-technically minded friend
If you're trying to get away with not changing the BB, the FC-RS200 is probably your best bet. You're probably going to have to adjust the FD, as older Shimano road doubles are more likely to have a 113mm BB than the 110mm recommended for the RS200
Depending on how badly stripped they are, a good LBS may be able to repair them with a helicoil or something; they will also probably have some cheap (non-Shimano) ST cranks that will work.
Even Claris has gone to HT2 now, so you'd be delving into some alarmingly shit OEM groups to find a Shimano square taper road crank, e.g. Tourney FC-A070
or the slightly less revolting non-series FC-RS200 which is no more expensive than Tourney