Where would I look to find the source of a clicking noise. It occurs once per revolution of the cranks and stops if I'm not pedaling or if I soft pedal. This is a recumbent bike but the drivetrain is the same as any other bike. I've checked for loose bolts and found none. I thought I found the source as the front thru-axle was a bit loose. Tightening that didn't help. I'm thinking bottom bracket but that's beyond my mechanic abilities to pull apart.