I send an email to Don Newman asking him about the frames and if I could hold 30-35 N/cm on those:
"No the original M-1 NRFrames were engineered for only 20 to 22 Newtons back then.
And the hardware on your 30+ year old M-1 frames are corroded and the small plastic hardware will not likely make it that high in Newtons. If it does manage to get to 20 or 22 Newtons, it will not last very long before they break. I hate to see so many well meaning printers taken of advantage of like this.
This happens to a lot of printers buying used frames. They are often not the model frames they need, very dirty, and damage that becomes obvious after a while, or there is hidden damage
inside of the rollers and components.
I suggest you work to return them and get all of your money back."