I like the unit but the middle knob broke in two . It is a wooden ball ? Split in two . Should be plastic knobs . I need a replacement knob but it does not state the material it is made of ? Would rather have plastic knobs and would be willing to pay more up front .

The fiber spacers are unfinished on the edges. They are rough cut and do not conform with the curvature of the aluminum plates. This can be rectified with a bit of work to sand and polish the rough cut and make them conform but that should be done in production. The lack of space between the levers presents a challenge for fitting two clevis adjacent to one another. The Clevis size to use would be useful in the Accessories tab of the product. If such a clevis exists. Without that information one cannot be sure if these may be used without a lot of work.