The three smaller fins were glued into position on the shorter ST-16.
This fin can assembly was dry slid (no glue yet) over the three engine mount tubes. In the first picture you can see the fins strips are taller than needed.
The bottom edge of the strips was sanded down using 220 grit sandpaper on a block. They were slid in place under the top of the ST-16 fin can assembly from the front, not the back.
The strip in front shows the height after sanding down the root edge for a better fit.Behind it is a strip at the original height. You can see how much was taken off the fit inside the larger fin can tube.
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