about 10 years ago when i was looking for one the only one at that time was from TIP, but at that time didn't have it for the pulleys i was using. i think they do now or perhaps could make one???
i have the butler one, while it works, i do miss that ability to put a wrench on the bolt to rotate the engine.
i use the march serpentine setup with the pioneer sfi balancer, and the butler mandrel. it's got some weight to it too
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