This whole piece is cut out of high quality plate steel and holes are punched out. Then bent or broke in a press break making this a more expensive to build, but an improved design that will last. When you tighten the Ubolts, you get a firm grip from letting the bedder discs turn or twist. The style you spoke about on the Leinbach GB-48, if you happen to overtighten the set screw, it can pull the nut off the welded tube.
Either way, it is 4 nuts to loosen and remove to change bed width. To change the angle you simply loosen the bolts and turn then tighten. The one you are looking at is the Everything Attachments GB-60, and the comparison unit would be the Leinbach FB-60 which uses the same Ubolts, but our implement has two rows instead of one to make the stem and bedder disc rigid.
Attached is the GB-50 prototype (shown with optional furrowing attachment that is really close to completion. It is quick hitch compatible as well, has narrow and wide pins, and uses one knuckle instead of two so that would take some work out of it for you.:thumbsup: