Does anyone have experience in adjustable torque air screwdrivers? Can you
recommend a brand?

I want to put 4-40 TC screws into an aluminum casting.

I suppose I should go twist off a few screws with a torque wrench to see
what level of torque we need...

We are using electric screwdrivers now, but they are kind of wimpy and need
to be recharged too often.

Thanks in advance,
Bill Chernoff