I, on the other hand, contacted Marcus and got a set of knobs and I'm very pleased with them. I actually only used the large one on the bottom of the saw and it is exactly what I needed. Before I put the know on, after many hours of scrolling fretwork, My fingers would become sore of tightening and loosing the screw. But now, It doesn't hurt anymore. I don't tighten it more but it is more of the comfort and lack of pain that I really like.
By the way, it was a great pleasure working with Markus and received my knobs in 3 days! Great service!