Always test fit the centering rings.
On this build they were a little tight and required light inside peel to slide over the red engine tube.
The kit included an addendum for the engine mount. An engine hook was added after the initial kit run.
The addendum instructions have the bottom centering ring position set lower. With the ring too close to the bottom it doesn't allow the engine hook to flex.
I raised the low ring so a 3/4" space was clear at the bottom.
The top ring was glued just over the top of the upper bend of the engine hook. A pencil line was drawn to show the top of the hook position.
The instructions sometimes have you knot the Kevlar under the upper ring.
There's very little room for a double knot between the diameters of a 20 and 50 tube.
I sometimes do a wrap of the Kevlar line, this keeps the tie closer to the engine tube. This is tightened and pressed into the wet glue fillet against the ring joint.
Notice the red tube is darker than the rest of the tube.
The red tubes are sometimes a little rougher than a standard brown engine mount tube. Some medium CA glue was "brushed" on using a Q-tip. That hardens the tube and allows for smooth sanding.
At the bottom right you can barely see a line of sanded CWF filling the seam on the red tube. The CA glue and sanding followed the filler.
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