The top of the slot is rounded using a small rat tail diamond file.
File a bit, check the fin fit and file some more until the fit is good.
This is the finished slot showing the alignment of the rounded leading edge to the rounded top.
This is the fin fit up to now.
The fin tab was purposely cut long and will be cut and sanded to the correct width.
I wanted to make sure the tab wasn't cut too short. I succeeded here!
After fitting the tab, the root edge of the fin will get a line of epoxy and be glued onto the motor mount tube.
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