150 grit sandpaper was wrapped around a 24mm casing. (that's actually a 24mm casing with an 18mm engine inside)
Be careful when sanding, it won't take much to get it to the right friction fit of the 50 sized engine mount tube.
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Here's a dry fit of the enlarged engine mount from the rear of the fin can.
And from the top of the fin can.
(The heavy walled BT-50 hasn't been cut to size yet.)
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