I am attempting to resurrect a Pentacon Six TL and the documentation indicates the shutter curtains have an initial spring tension measured in "CMP" For example, the 1st curtain value is 110 cmp. I can use some guidance on what "CMP" actually is so if there is an SAE equivalent I stand a better chance of measuring it with the tools I have or can hunt for. Do any forum members have insight on what this abbreviation stands for? I've searched the web and found nothing relevant. Any help would be much appreciated.