You can't just sand the raised areas off and end up with a smooth surface.
Brush over the raised areas with medium CA applied with a Q-tip.
Sand with 220 on a block to surface. Apply more CA and sand smooth with 400 grit.
I wouldn't normally bother with the raised edges but these surfaces will be seen on the outside off the finished model.
This picture was taken before the ring on the bottom was trimmed to match the upper ring.
The rings were sprayed with primer/filler and sanded.
On the left is the top smoother side.
On the right is the bottom side with the raised edges that were CA'd and sanded down.
The fit of the rings was very loose.
The centering ring will end up 1/2" from the rear of the engine mount tube.
For a wider outside diameter, a glue stick was used to adhere a single wrap of 20 lb. copy paper.
That was enough for a good fit of the rings.
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