[AndrewSears]

We were thinking the same thing. We found a spring chain tensioner last night and are going to try that after adding 2 links to the chain. We have a floating pin (1/2" bolt) in the take-up that allows slight motion and everything is captured with flanged bearings. We have double nut on the end of the bolt so we would not put a thrust load on the bearings. This sprocket is running entirely on the bearing inner race....

Now that I think of it, I wonder if this being allowed to float slightly in the bearings could be the problem.. ?? Since everything is sandwiched between flanged bearings, maybe we need to tighten this up a little so we lock everything to the inner race of the bearing.