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Florence - 144 AWD Cargo
I have the 1450 - I suggest practicing first on hole size and the setting adjustments on the mandrel - the fan cutout makes a great test pieceThe big Astro? (e.g. a 1442 or 1450)
Maybe it's moving/twisting while you're applying force?
I have the 1450 but haven't started on my RivNuts/PlusNuts yet.
I also got the wrench-based tool (for tight spaces) from McMaster, but it only does 1/4-20 and 1/4-28.
For sure compressor is the way to go - father in law has decent size one that I snag once in a while - but he has limited tools so I have to work up my justification for new tools