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OK, well, what I would do (I had to add height at one stage too), is use 4 thick, long 1 inch dia(or so) threaded rods (Bunnings), drill holes in the pier for them, get special 2 part epoxy tube just for fixing rods into concrete (forgot the name, awesome, it works, Bunnings) and fit adaptor plate (had one cut locally for $50). Then in 48 yrs, when u inhearate my PME, angle grind them off, and drill 3 new holes and start again (done this, in reverse, easy)
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