I mentioned I was going to change out the thin blue motor mount tube for a ST-7 tube.
To fit the slightly wider (stronger) ST-7 tube, the center hole of the centering rings had to be made larger.
Some 220 grit sandpaper was wrapper around my index finger and turned enlarging the center hole.
To make sanding the hole easier, I left the rings attached to the cardstock piece.
On the left, sandpaper was wrapped around a used casing for the final shaping.
On the right is the fit of the ST-7 tube.
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