The end of the Kevlar shock cord is knotted. This knot sits under the bottom of the engine block. Typically the engine block is pushed in so it ends up even with the top of the motor mount tube. This long engine block would place the engine too far out the rear of the model.
I cut the engine block down to the shorter correct size. With a MicroMaxx engine in place it should extend out the back for easier removal after flight.
Shown above - The engine mount tube has already been marked for the centering ring placement.
Wipe down the centering rings before gluing them onto the motor mount tube.
Here's the complete motor mount.
The centering rings have got small glue fillets.
One of the cutaways on the build jig has a engine mount depth gauge. Use this when sliding and gluing the engine mount into the main air frame tube.
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