I rarely use the yellow or blue engine mount tubes supplied in kits. They are usually too thin.
The two substituted ST-7 engine mount tubes fit pretty well, side by side in the Big Betty's 40mm tube.
Test fit both to check the engine hook movement. I turned them in to the center a bit for more clearance.
A line was drawn down the engine tubes to make sure the hooks were in the right alignment.
Draw the lines over the top and bottom for easier reference when glued together.
The tubes wouldn't sit close with the electrical tape wraps.
Strips of card stock were glued down the lines to make the sides even for better gluing.
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