Bullet

That's great. Thanks again for your help and patience. 

Both screws press on the ring. However, if necessary I can rotate the brass ring and then use just one screw to tighten directly on the parallizer, or rotate the ring and use one screw in the middle of the ring.

It's a 2" focus extender Here. 

Thanks for your help. It is much appreciated.  How would I set up if I need a focuser extender?. The focuser clamps onto the extender, and then the extender clamps onto the HGP. Both focuser and extender have split ring compression.  Thanks

After reading other threads, I think I've got the idea. The compression of the focuser to  HGP, and HGP to eyepiece should be opposite, which makes sense. However, what if you use/ need a focuser extender?. Then you would have 3 seperate clamp directions. Maybe have them at 120 degrees apart?

Thread resurrection. If the HGP screw is to be opposite the focuser screw or screws, what if your focuser uses a split brass ring. Would the HGP screw go where the split in the ring is? ie still opposite the screw ( or in my case 2 screws). Thanks