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I put spacers under my springs, Turned up some 25mm wooden disks, replaced the bolts with longer versions and slid the spacers and springs on. Spacers don't move and the holes in the spacers and the base ring are a firm fit on the bolts so that ain't going to move. Plus if it is going to be permanent then you can glue the spacers in place.
No lathe ? plenty of alternative 'spacers' at Bunnings or elsewhere, and they don't have to be round anyway. Just have the right size hole through middle and they can be square or oblate or ....
It's an easy and cheap way to shift the mirror up the tube. Cutting the tube is permanent and irreversible.
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