The bulkhead print was glued to a piece of framing mat material.
TIP: You can pick up mat material scraps from a frame shop for next to nothing, sometimes free! It's strong and great for home made LPR centering rings.
After drying, Cut out the center with a sharp #11 blade.
I wrapped 220 grit sandpaper around an engine casing to get a better, clean edge.
When sanding, constantly check the fit of the ST-7 tube.
You can keep the rolled over "lip" on the back side of the bulkhead. It gives you a wider gluing surface.
On the printed side, roll the lip into the center hole and sand off. You'll want a clean edge when seen from the outside.
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