Just ordered the tubing from Hastings!

I ordered 4' of 10.0 O.D. .064" tubing.

That makes an inner diameter of (10.0 - .064) = 9.936", which is OK for the primary mirror cell that I'm going to order soon.

Now I'm going to --gasp-- order my primary mirror.

I'm going to order an 8" f/4 conical cross section primary, center spotted with normal coatings (those 'enhanced' coatings never pan out for me--too difficult to remove) from RFRoyce in CT. Everything I've read is good about rfroyce. I'm going to take a chance on him. He wants a down payment of $100 and residual $695 when mirror is done, about 3 months from now.