I am using no hub couplings to connect drain pipes and the couplings are
made of stainless steel clamps with a 3/8" hex head with specifications
called for tightening to 80 pound-in.

I have a torque wrench that will tighten to 60 pound-inch and then releases
but not 80, and I don't want to pay a lot of money to for a 90 pound-in
torque wrench just to tighten 2 couplings and will not have a use for it
ever. Is there any trick anyone can think of that would allow me to tighen
to that specification?

Thanks,

MC