I saw those, they look interesting. I was wondering, with the eccentric holes do you just turn the circles until snug then tighten the bolt and be sure it is tight on all sides? Have they been holding up well? Where did you get the o-rings? Similar to cam clams without the handles.
Yes, the eccentric holes are turned by hand to tighten on the material then the bolt is tightened to hold from turning. The ones with the hole centered is used as a backstop. O rings were ordered from McMaster and take up variances in dimensions of the wood piece along with holding the eccentric ones from turning. I have been using them for several years with very good results. Easy to make and easy to use which makes easy to replace. I used brass for centers but it could be plastic, wood or any material that would not damage a router bit. Since all the spoil board holes are threaded you can also add downward clamping for warped material. I like them and as I've said I have been using them for years now.