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Alex,
I used a jigsaw to cut my original tripod pier holes at 100mm diameter for my EQ6-R and then when I bought my EQ8-R mount I had to enlarge them to 160mm
Again I used a jigsaw but had to cut 12mm off the end of the blade ( with an angle grinder) so it wouldn’t hit the concrete pier 12mm below the underside of the deck boards
My deck boards are Merbau hardwood (18mm thick) not particle board but the jigsaw worked fine with a medium tooth wood blade, but had to hold it firm as it wanted to jump a bit with the shorter blade
Took me half an hour and job done
Cheers
Martin
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