Jimc, It is probably just the angle or the way the light was hitting it, but it looked to me as if it may be starting to frey a little on the edges, and the alignment off just a tidge. It all looks to be so very pristine everywhere else that the belt looked "out of place". Lookin' at my stuff I shouldn't be one to talk. Another bad habit. Now that is a rigid fan though isn't it?
