I cannot imagine the latter touching the pavement without the bottom of the end cap dragging on the ground first. You have done a very nice job of repairing the damage with PVC pipe and fittings. You might find that "Goop" will provide enough of a grip on both the aluminum and PVC to make a suitable connection. Or perhaps you could drill through the fitting and aluminum and hold them together with stainless steel machine screws and nuts.
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