Bought this to mount a small guide scope on my William Optics Megrez 72 scope. Although the base has provision for two fixing bolts, there's only one attachment hole on the scope. Nevertheless this seems to hold the guide scope firmly and I've had no problems with any movement when guiding.

Purchased as a red dot finder mount for my Z61. It fits adequately but is obviously made for a larger diameter 'scope. It is secure though and will only ever support the RDF so is not likely to be stressed.