Ahh Alian Gremlins! The Number of the Beast, you could call it 666 or Be'alzevuv (the original spelling!).
I think your problem was in the way in which the A frame was held together. Relying on aluminium grab instead of nuts ain't the best. You'd be better off redoing them with large pop rivets, that way you could put in three or four p-r's to reinforce the frame. Looked like an aluminium version of Burr Castle, but without the speculum mirror!
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