Made this for my 6in rotary table making it a 8in with a cut out for 2 1/4 x 1/2 keyway stock giving me a 90 when I need it. Each hole is taped for 6mm and drilled and reamed to take a 1/4 dowel. All of my clamps are 6mm and they work with the 3 pallets I've made.
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The center pin is a centering pin and it all locks into a MT2 mandrel that I made for the table. I copied Quinn's jig to round corners and can use that with or without the pallet.
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Having lots of fun with this mill and lathe....