There are some confusing illustrations in the blue addendum sheet.
In Step 6 the clear Mylar engine lock ring is glued closer to the center of the motor mount tube.
In Step 7, it looks like it has slid down and in Step 8 it is back in the correct position again.
On the (white) instructions in the kit, the ring positions measurements are very different from those on the blue addendum sheet. On the white instruction sheet, the rings are in a different position that wouldn't fit the fin tabs. The lock ring is butted up against the lower centering ring.
Before any glue, the mount pieces were dry fitted based on the measurements from the blue addendum sheet.
If you haven't done thru-the-wall fins before, this could help you understand how everything will fit together.
As you'll see later, a few adjustments had to be made to get the fin trailing edge to be flush with the end of the body tube.
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