It's easy getting another non-drive cranks for a tenner, the hard part will be finding a 165mm one.
Go to any bike shop and ask if they have any 165mm left cranks arm, and perhaps worth asking them to ensure the bolt are correctly torqued onto the cranks.
It's also worth greasing the spinel a tiny bit (anti-seized) to ensure a good fit.
It's easy getting another non-drive cranks for a tenner, the hard part will be finding a 165mm one.
Go to any bike shop and ask if they have any 165mm left cranks arm, and perhaps worth asking them to ensure the bolt are correctly torqued onto the cranks.
It's also worth greasing the spinel a tiny bit (anti-seized) to ensure a good fit.