Torsion rod adjustment

I haven't read all of the service manuals procedure so I'll add this in a 'grain of salt" fashion...
Lift the vehicle weight, adjust, lower again. When these parts were brand new one might have lifted the vehicles weight with those screws. Today, at 50 years old, thread damage will occur.
I sold a 68 notch back 2 weeks ago and those torsion adjusters had been completely relieved. I insisted we put a floor jack under the K, lift, wind the adjusters up a bunch of turns and let'er down again. My only goal was to keep the lower valance up and off of the roll backs bed.