I recently had the dilemma of figuring out how to dye/stain and finish a bunch of small shelves on all 6 sides in one go.
Below is what I came up with.
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A bunch of 3/4" dowels with a machine screw inserted into them and then inserted into the MFT.
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Most of the posts are wood dowel but those green guys are from the Qwas brand of products designed to fit the MFT holes. The 3/4" wood dowels fit good enough to hold up my small shelves. I used 1/4-20 threaded rod and drilled 17/64" holes into the 1/2" plywood shelves. In hindsight, I should have used a 9/32" drill as it would have held the shelves tighter...some wanted to spin too much IMO. Perhaps one of the lettered drill bits, H, I, J, or K might've worked better, too. YMMV.
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To keep the dowels from dropping through the MFT, I bolted up a large sheet of 3/4" MDF to the underside of the top. That was actually a bit tricky to do and I ended up turning the whole thing legs-up to get the MDF secured. I only need to secured the MDF at two diagonal points.
Anyway, this worked out great and I was able to quickly and cleanly spray dye and clear on all sides of the shelves in one shot.