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Jack,
John is correct putting the mirror back in the barrel is easy when it is out of the cabinet. The center depression on the spherical mirror needs to be painted black, so the high intensity light doesn't reflect back on the CRT face. I just use a flat black high temperature paint that is sold for repainting grills. It's in a spray can, just spray it into a bowl or plate then brush it one the mirror, doesn't need to be pretty.
You probably wasted money getting the flat mirror resilvered, I've found that there was very little improvement in screen brightness or quality with a new mirror. If you really want a clean flat mirror, a new back silvered mirror as thin as you can get works fine. Get one 1/8"-3/16" thick and use a thin backing board glued to the mirror if you need more thickness to reattach with the original hardware.
The correcting lens has a flat side and a curved side, you need to reinstall in correct orientation, I think the flat side is up. The lens corrects the reflected light so the rays converge to a point as they would if the mirror shape was parabolic instead of spherical.
Chuck
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