Sometimes you can clean up the burn marks from the laser cut process.
TIP: Try a white eraser first, not a pink eraser. A pink eraser leaves behind a pink color. If that doesn't work, try an old piece of 400 grit or finer grit and gently sand.
The inset picture shows the same ring, cleaned up.
The upper engine mount construction is standard.
The upper motor tube is 2 3/4" long.
The lower centering ring is 1/2" from the bottom. The upper ring is just over the top end of the tube.
The Bertha style nose cone had a slight mold seam after sanding.
A bead of medium (not thin) CA glue was set down the seam. A bead of super glue can take a few minutes to dry. Prop up the nose cone so the glue can't run.
After it dries sand with 220 grit followed by 400 grit.
TIP: I always sand and round off coupler ends.
It makes it easier to slide without lifting the inside edge of the tube.
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