This is the same question I have. I contacted SPC and a rep told me to use a crow foot wrench. I have not tried this yet but one of the crow foot that I came across said something about not putting too much pressure on it. That made me wonder if the crow foot did reach the adjustment nut, would it be able to withstand the pressure while trying to torque the nut to 120lbs.
I'm still looking for a shop that can do it. In the meantime, my Z sits in my garage. I torqued the nut up to about 90lbs while everything was loose and the arm was hanging. That's about as far as I could go. My torque wrench kept slipping off the nut when I tried to go further. I think it's going to be a PITA to get to 120lbs without the right type of tools.
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