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Well I mounted my bracket last night on the bike and clamped some upright square tubing that will mount the backrest pad. I noticed with the new found leverage that when pushing backwards on the pad that my rubber grommets I was planning on using actually really suck because they give too much. They need to be more rigid.
I cannot find any good plastic or rubber bushings to make this work, so I ordered some nylon rod and will be I machining some custom made bushings for the project. We will see how that goes.. Also, I am giving that same new design to my buddy who will 3D print me a set. We will see how that looks too. This backrest is a lot of work!