The “fixed” end of the threaded rod is attached to the fence, but the whole assembly is easily removed. The holes in the brackets (router fence side) are actually threaded - the dome nuts are just
for appearance. The front wood mounting block is threaded, the rear (support) block just has a ¼” hole. I’ve found I don’t need to have a fixed rule. The fence slides on thin UHMW feet, which provide enough clearance to slide the rule under the fence. When I need to move the fence, I just slip it under (butted against the ½” MDF base), and then remove it. Because of the UHMW slides, and because the fence is essentially “balanced”, it moves smoothly with virtually no “swing”, which means that I don’t need any guide bars.
for appearance. The front wood mounting block is threaded, the rear (support) block just has a ¼” hole. I’ve found I don’t need to have a fixed rule. The fence slides on thin UHMW feet, which provide enough clearance to slide the rule under the fence. When I need to move the fence, I just slip it under (butted against the ½” MDF base), and then remove it. Because of the UHMW slides, and because the fence is essentially “balanced”, it moves smoothly with virtually no “swing”, which means that I don’t need any guide bars.