Help - Cadence Counter Crank Magnet

[dianne_1234]

I have also thought about some kind of putty or something to fill the hollow before attaching the cadence magnet.

Seems like some kind of epoxy putty would be great for this.

What I was wondering about that, is if I would also need to put putty in the corresponding spot on the other crank, so as not to create some kind of imbalance that would cause wear and tear? (I'm kind of thinking like when wheels are out of balance - perhaps I am overthinking this.)

Definitely overthinking. No need for a counterbalance.