Because we're using on continuous 9" length of ST-7 tubing, you con't be joining two separate pieces with a coupler shown in the instructions. With a file, the thrust ring (engine block, or whatever you want to call it) gets a notch for the Kevlar. I wouldn't use a Tri-Fold Mount in a tube this small, it could block a parachute from ejecting.
When installing an engine block, have everythng ready before grabbing the glue. The Kevlar is already threaded through the open engine casing. (the nozzle has been removed)
My dowel is marked to apply glue at the correct distance in the motor mount tube.
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