Having just purchased an AZ Mount Pro, I’d read that the Alt clutch needed to be tightened very securely, and whilst that can be done with the normal knurled ring, these were recommend to allow really good tightening. They work perfectly and very easy to tighten and loose again. Not had any issue with the scope slipping at all. Delivered rapidly as always from FLO. Thanks.

Yes these are just what is needed to get a good grip on the locking knob. They fit well, and are machined to a good finish. Good price too.