Hook a luggage scale to your adjustable wrench and apply torque with the scale.
With a 1 foot wrench and 50 lbs on the scale you have 50 ft-lbs.
I have one like this.
https://www.ebay.com/itm/Portable-Luggag...rk:10:pf:0
With a 1 foot wrench and 50 lbs on the scale you have 50 ft-lbs.
I have one like this.
https://www.ebay.com/itm/Portable-Luggag...rk:10:pf:0

