I agree the Art Rose fin alignment jig and mandrels is the #1 Best.
I have two fin alignment jigs I use one for Micro's to BT-50, & 1 for BT20 to BT-101. both home make pics below.
By using a shim piece of the same thickness as the fin being applied between the top and bottom Jig V plates. The fin/body joint is automatically centered on the body tube perpendicular to the body and always 90 degrees to the tube.
While I still have to locate each fins location of the tube (using a standard Estes tube marking guide) This fin jig ensures all fins are parallel to body tube which is the most important part.
I have two fin alignment jigs I use one for Micro's to BT-50, & 1 for BT20 to BT-101. both home make pics below.
By using a shim piece of the same thickness as the fin being applied between the top and bottom Jig V plates. The fin/body joint is automatically centered on the body tube perpendicular to the body and always 90 degrees to the tube.
While I still have to locate each fins location of the tube (using a standard Estes tube marking guide) This fin jig ensures all fins are parallel to body tube which is the most important part.
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