I made a horn pad for my Petri wheel some time ago. Did not have the means to make the hardware bits to fasten it to the wheel. Finally have the tools and the means to do so thanks to my CL purchased 3D printer and Solidworks. I am still an absolute novice with these two tools. But, it's amazing what YouTube, sheer stubborness and hours of trials and errors will do... The grey bits are threaded inserts for the pad. The white screws were printed from flexible plastic.