Note: I used a longer piece of scrap BT-20 I had from my spare parts box. It will be easier to shape a longer piece of body tube then cut it down afterwards.
The fin marking guide from the instruction sheet was used to mark the six scallop lines.
A piece of paper was wrapped and a pencil line marked along the top. This horizontal line will be a depth gauge for the scallops.
220 grit sandpaper was tightly wrapped around a 1/4" diameter dowel.
With the dowel almost parallel to the top of the tube, sand a scallop into the top edge of the tube.
Stop sanding just before you get down to the horizontal pencil line.
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