I think Bill Berning (Penny scales .com ) still rents out scales to business. I think that's what his flyers said when I bought some parts from him last year . He was very helpful when I redone a set for my son , he had all the parts and even bought a better original head and mirror to go on mine.
I reached out to him this past April to see if he had any diagrams for a Toledo penny scale I picked up and never heard back. Not sure if still in business?