I open up the "A" Frame holes to be a good sloppy fit.
Fit the frames with the shaft inside.
Check all dimensions.
hold in place with a little superglue, leave to set overnight as the superglue fumes will attack the epoxy.
Apply masking tape to the outside of the hull and pour a little epoxy over the small protrusions inside the hull.
When all dry, everything checked again, if all OK, make a little box out on blue tack oner each protrusion then pour more epoxy in.
Never had an "A" Frame come adrift even when model dropped on it.
It did bend a little, but was straightened out with pliers.
Bob