Thank you ma,
I have ordered a couple of the reflectors in the link you provided, and also picked up the Mag duo set at Costco. Would the focus mechanism (angle cut neck) on the reflector be required or used for most mods? In other words, is that something that I should count on providing as part of the reflector?
The D reflector has a hole diameter of .500". I understand and agree about the flat at the focal plane; do you have a suggestion as to a minimum hole diameter to begin with? I'm not entirely comfortable with using a step drill on the reflector, the nickel won't cut the same as plastic or even aluminum.