As I found out, the most productive way to solve this one is
a) to move away from the "pry" "loosen off" "wrench/prise open" idea, suggested by terms like こそり棒、こそり穴　that tend to come up first when looking for こそり　compounds,
b) go for where 耐こじり性 and 電流サイクル, supplied by the context, can lead us.

耐こじり性 gives us 'torsional resilience" suggesting drive shaft stress strain and engine torque contexts. 電流サイクル is a boon pointer that induces us to switch from 'engines' to 'electric motors'.
Now how on earth can a constant current cause torsional vibrations? Well it can! load variation at the other end of the shaft is not the only factor of shaft fatigue. Enjoy as I did those two articles that shed a fine light on this, and make your choice of term.
(Read the lot, but "critical speed variations", particularly, from the first one) :-)