No slack adjusters????? Oh no Mr Bill how could it be?? Its magic!!
Just kidding. I'm a firm believer in these knor bremse brakes. Noticed lot of fire truck chassis also use them whatever that's worth.
Thats Great news.
OK I have resurrected a knore bremse brake thread that contains everything in regard to the brakes. It will explain the adjuster along with everything else. Go read through that.
I have someone checking the prevo service manuals for me so I can be absolutely sure the info regarding the pinch nut is spot on.
He has an extra prevo service manual for your vintage if u would like it he said 50 bucks that's a deal u should have it. He used to be a pogger, Lonesome George. Lemeno I'll hook u up and post the correct reassembly of the pinch nut and corresponding washer.
In the meantime read through the brake thread I've pulled up.