Quest has you tie a knot in the Kevlar and pass the line under the upper centering ring.
There isn't much room between the yellow motor mount tube and main air frame tube.
I wrapped the Kevlar under itself three times and tightened the line.
The wrapped line was set into the glue fillet.
Trivia: Quest might have been the first to make engine mount parts in different colors - Green engine block, red centering rings and yellow engine mount tube.
When I started in the hobby everything was brown. We were all able to figure out which part was which without the color coding.
Here are the closed lugs between the fin and fin can.
I would think they were meant to be open and act as launch lugs. This is probably what happens when a large order of replacement parts are made in China - the first time.
Trivia: From the 1970 MPC catalog is the same fin unit.
The description says: "Molded in launch lugs."
The glider goes on one side of the model so one fin and "lug" gets removed.
Score the plastic on both sides.
The fin and lug broke off easily after rocking the fin back and forth down the scored line.
The inset picture shows the same seam after sanding and polishing smooth.
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