My first EUB build was based loosely on Bob B's EUB build and mounts on cymbal stand via a tom-tom mount screwed into the back. For my next build I want to do something with an endpin and upper bout extension arm. I'm early on in the design stages and am realizing if I want the endpin to store inside the instrument, I need to figure out what sort of collar arrangement I want to use before going much further on the body design. I'm also realizing that a standard length endpin isn't going to be long enough because of the shortened body design I'm wanting to use. With my current EUB on the stand and at a comfortable playing angle, the nut is about 73" (straight line down the body) from the ground. My new EUB design is coming at just over 50" from the nut to the bottom of the body meaning I need 23" of endpin length. (I'm 6'4" tall which isn't helping matters on my design either... ) On Bob G's site, he carries an "extra long" endpin that can go 16" long, and I'm seeing some that claim 18" long. -So I'm now to the point where I'm wondering if you can buy just the collar and tension bolt and then I could go buy an aluminum rod the right diameter and cut it to length? -Would a standard DB collar handle the torque a 25" endpin might place on it while in use? -Are there other hardware options that might work better for this? -What about cello endpins which seem to come in longer lengths? Would they be strong enough? I tried the search and it seems this question has come up a few times with not a whole lot of resolution being found.... Thanks in advance.