Maybe its just the picture but are those bolt holes on the sheave out of round? I cant see how those bolts would back themself's out that quick i am also wondering was the helix totally compressed against the sheave before installing the bolts because it may have hung up on the rollers making the bolts feel tight but helix not seated properly on the sheave, then if the shop just pulled and replaced one at a time they may not notice, just a thought. if a bolt was sticking up on the helix that could be the problem looks to me by the pictures the bolt were loose you may have had to cut the lower bolts down with the slp helix. JMT
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