I’m doing my first build and while the parts are printing I had time to overkill my tubes a bit. I printed 20mm sleeves to slip over 1/2" conduit and used JB Quick to adhere them, spacing them equidistant along the length. I then inserted the assembly into the 3/4" tubes and slathered JB Weld (longer working time than Quick) at the sleeve locations. There is absolutely no flex in these tubes now![attachment file=116875]
