Quote Originally Posted by john_s View Post
Sometimes with a strip each side of angled metal to minimise bending caused by the constant pressure of the leaning enlarger head.
The OP mention he had a Beseler 23CII-XL and I looked at my Beseler 23CII-XL, which had no such metal and is 3/4inch thick. Nor does my very large Durst 4x5 although it is 1.25 in thick. However, on my Beseler 4x5, the whole frame is attached to angle iron which then attaches to either (3/4 inch thick) wood or MSD, depending on the vintage of the enlarger.