Hi, The question mostly addresses to those who use to build aluminium scopes... I have nearly cut the OD of my sec cage aluminum ring and I am wondering whether I should use the Al disk left after the ID cut to make the triangles for my mirror cell or if here is another good usage of this 675x6 mm (about 27"x1/4") Al disk??? Protect the mirror (smaller by 1 inch)? What would you do? Thanks Hugues