No Foot Fall TT Mount
Here we have some fun and some work. Fair warning! Do not attempt this unless you are confident that your platform will hold at least 5-10 times your TT weight. I have about 100 pounds up there. And make sure your ceiling rafters are true load bearing. Some ceilings are just 2x4s nailed to the walls.
One of the beauties of this design outside the obvious is you can adjust your platform absolutely level. I used 5/16” threaded rod but use at least 3/8”. Drill, tap and epoxy into the rafter at least 1-1/2”. Yes – tap, when it’s done right it’s like a steel nut. Do not use 5 minutes epoxy for anything that’s critical. It does not have as good adhesion and the pot life is too short to let the glue flow into pores. For this job I used JB Weld. It’s thin enough to really pack the hole and the rod but not too runny. There is some sway until you get some weight up there because of the flex in the rod. But when it’s all done it’s not an issue.
Make your platform bigger than needed. It’s nice to be able to put a light up there. DO not let it touch the wall. Put your hand on the wall with your music on loud. You’ll know why.
Use at least ¾” doubled plywood for your platform. You can even isolate the rods from the platform to some degree. Use some kind of isolating washer or bushing like sorbothane or something, I used lead with the same O.D. as your recessed hole in the bottom and the same I.D. as the rod. Then make your main hole a little larger than the rod. This way the rod only touches the isolating washer.
Use lock nuts on the bottom and cover the rods with whatever you want. I used copper pipe insulation. Cut it, slice the back and pop it on. I think it looks good. If I were to do this again I would cut out the drywall and throw a couple of 2x6s up there (if you have room) long enough to bear on 3 or 4 rafters. Then double nut ½” rod (less sway) top and bottom of the 2x6s. This would also give you more placement options.