I found what I think might be the ideal material to fix the upper shaft loosening issue. It comes from a company called "Talon Grips", that makes rubberized grip material for handguns. They sell the raw material in two sizes, the smallest of which will cost no more than $2.50, not including shipping and tax. The smallest size is 1" x 4" and should have enough material to fix 5 camlocks. It's textured and flexible as well as being self adhesive. You will want to choose the 'rubberized' finish instead of the 'granulate'. As mentioned in my first post, two pieces stacked together may be necessary for extreme wear on the pressure pads. Though the duct tape works, this material is more robust, and being rubber, will grip more securely against the upper shaft and eliminate slippage. Here is the link to the material: https://talongungrips.com/other-grips/diy-material/ I hope this will breathe some new life into the upper shafts for you! Terry