Does anyone remember the 178mm ED APO and its radial alignment screws? I want to know - do these grub screws push onto a metal lens holder, or onto the actual side of the glass (possibly with a little tape between)? I have read the fab article on the alignment, but I can't tell from the drawing exactly what's going on.
I only ask because I tend to align it quite often, and I want to know just how 'gentle' I have to be. Some of the grub screws get fairly tight, and I'm not sure if it's just the weight of the glass pushing back or something is sticking.