Step 4Axle
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In place of the original axle, I used a 5/8" threaded rod. Dimensions on your wheel may vary. Drill a hole in the center of the core block with a 9/16" bit, or 1/16" less than the diameter of the rod. I went down three inches. Squirt a little urethane glue in the hole to make sure the rod is seated securely, and screw it down into place using some vise grips. Put the grips on the bar code label to prevent damage to the threads.
I drilled a hole in an old chair and screwed the frame into it upside-down to sand and polyurethane it. You could pop a hole in a scrap of wood or your workbench.
Trim the rod down to the total height from floor to tip is around 17".