Beekster, it's some good drawings here https://www.dropbox.com/s/vkez99sgu8unxy7/Madill 071 Operator's Manual.pdf. If you get a spare part manual (should be some of them around) it would even be better. Good luck!
Thanks, Torkel! I do have this manual, provided to me earlier by another member of this forum in the days before DropBox existed. For reference I have the operator's manual, a production list, a factory brochure, and hundreds of photos. A goodly number have been found on this site and elsewhere on the internet. I've also got scans of old 35mm film pics I took of two yarders in Washington many years ago, and several dozen digital images of #70097 that I took in Tillamook. Might have to take another trip out there to see if there's anything I missed; perhaps try to get the tape measure on a few other things.