gstaylorg said:Is it possible you might have some transient contact that suddenly stresses the drive belt due to intermittent side-to-side movement of the rods while it's turning?
gstaylorg -
It's interesting that you mention some sway in your drum. My Model B also had side to side sway as soon as it was set up out of the box and running. To address this, I tightened the clips on the end on each axle. With less play, the sway is gone but the axles still turn freely. I'm also told this can be corrected by slightly bending outward the walls of the base. The owner of the company told me that just tthis morning.
Bayou