Before setting the engine mount,
the TTW fin slots are removed.
You'll want to see the centering rings position through the slots.
Remove the launch lug slots, too.
Slide in the engine mount.
Slide in the fins, don't fully snap them in place yet. You are just checking that the centering rings are above and below the top and bottom of the fin slots.
The end of the engine mount tube should be even with the end of the main airframe tube.
I set my sanding block onto the end to make sure both tubes were even.
The mount will be locked in place once the TTW tin tabs are snapped into the locking rings inside.
On the left,
The upper tube is flipped over for the coupler to be glued up to the 3" halfway pencil mark.
The shock cord is draped over the end.
TIP: To keep any epoxy glue off the shock cord, I applied some tape and slid it down the cord to where it might contact any squeezed out epoxy.
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