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My pier is 6mm thick 102 diameter steel bolted to an existing large concrete slab on footings and it seems quite stiff. I have also made 30mm pipe knee braces to half height for a previous installation but found I do not need them.
Rather than the cage, if you can cut a 60 mm hole in a 25mm thick 100x100 aluminium plate ( or three stacked 8mm plates or steel ) and bolt that to a removable 150x150 base plate. You can fit the plate to the HEQ5 mount and bolt down the whole assembly each time to an alignment line etched in the plate. Or swap mounts as I do on another plate.
Just ensure you have a 30mm hole in the middle of the pier top plate to accept the mount bolt head.
If you use a cage, the bolts should be quite beefy, so that their cross section adds up to the same as the material in the mount base.
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