Lower priced Power lok, sure grip units on Ebay.

mopowers said

Personally, I wouldn't care. If they're backed by him, I'd trust it a lot more than anything sold by a no-name ebay seller.

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I agree. My point was, that the ebay piece and Dr. Diff's piece are likely the same. Seems like I read somewhere Dr. Diff disassembles all of his checks for clearances and such and he may even modify them for stronger lockup.