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Those nylon bushings get expensive real fast. I gave up and started center drilling dowels. Drill a hole in a wood block (clamped to your drill table) about 3/4" deep, the same size as your dowel, swap out drill bits, put a short piece of dowel in the hole, and drill 1/2 way through, flip it and drill the other end. String a bunch on a wire, soak in your sealer, dry......spacers galore good to go.
You can also use tubing as a cheap spacer, but you lose some buoyancy as the space will fill with water.
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