[g__day (Matthew)]

Ken - what you have done makes a lot of sense - its a great start. What I found difficult is how do you align the two OTAs light path. I started putting the two OTAs in my side by side bars and expected they should be pretty close to aligned - turned out it was too far away to be useable. So the smaller OTA had to become adjustable to match the larger which was locked into a fixed position. And that small amount of adjustable position causes differential flexure.