I struggled to find a right-angled finder for my iOptron Skyguider Pro, and had resigned myself to either continue struggling to view through my polar scope, or attempting to make my own {which became more tricky, the more i researched the idea}.
By chance i stumbled upon a ZapWizard video, which had exactly what i was looking for...and i ordered one straight away.
I already owned an old Olympus Varimagnifier R/A finder, which i was wanting to mount onto my polar scope, and hoped this adapter would fit this specific R/A finder...which it did {perfectly}.
I had already a small pack of 8mm M3 thumb-screws in a drawer, so i was able to attach the adapter to the scope immediately it arrived.
The adapter is excellent value for money, and very nicely made...and will certainly last me a very long time.
Because this adapter is NOT a thick-walled alloy tube, it should not be over tightened on the scope {to preserve the life of the internal threads}, but because it is very light, it is very secure with minimal tightening of the thumb screws.
I leave two of the thumb screws in their tightened position all the time, and just use the third thumb screw for tightening and un-tightening the adapter, when needing to use the polar scope/ adapter combination.
Certainly one of my very best accessory purchases.
The adaptor is sturdy and well made. Good fit on both the 90 degree adaptor and the scope. Glad I picked red, more visible at night.