I went to your page first, and saw your notation about removing the ridge, but I think you mean the first ridge - the one which might not allow some grips to slide all the way on? I bought the foam 786 grips which I was easily able to confine to the space I had up to that ridge. I didn't want to remove that particular ridge yet in case the foam grips impinged on the rotation of the tube. haha. Jokes on me eh? I'll crack this nut eventually.