The Simplex plinth I bought has the set screws. A friend is making the pot for me according to your measurements (he’s printing it 3D out of grey plastic). I bought a regulated AC to DC power supply and the motor turned nicely. I am making the pillar out of both black Denril and aluminum - I’m making a couple stainless steel support arms. I ordered a metal picture frame I’ll be using as an extended base so that the WTRP bearing, spindle and platter, will fit. This will give the table a beefier, taller appearance and add mass along with some pods of sorbothane for damping separating the plinth and base. Then on to making the arm. I have a few parts for that. The pillar Delrin I got is 5.25" long. The support arm is supposed to be 3.8" from he top of the arm to the top of the plinth. How long is your support arm? I’ve made them 3-7/8" long for my 2 clones.