A fin marking guide was printed from the "Tools" page at payloadbay.com.
The seam was lined up right above the fill valve.
The fin location lines were marked with a fine point Sharpie.
The lines were extended down the engine body using an aluminum angle.
If needed, any drawn Sharpie lines can be rubbed off the aluminum body.
The fin rails are glued on using Contact Cement. The aluminum body is roughed up so the glue will hold.
A strip was masked off, just a little narrower than the width of the fin rail.
220 grit was used to rough up the glue areas.
Look close, you can see the dulled, sanded strip.
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