Rod you could very well be correct. I have only been around two of the arm mowers. I never sold one myself. We usually need to condition the hay around here. The guys that do have arm type disk mowers around here could tear up an anvil with a tooth pick so they are not a good indicator of how they last/work.
Personally I run from any Kuhn style cutter bar. The JD ones are expensive to fix. Plus they are a real PIA to work on. I would like to stangle the engineer that though a ten foot long oring would be a good idea to seal a gear case. Plus the hundred bolts holding it together. I know there are not that many but it seems like it when you are holding that darn oring in while some one puts the bolts in.
My one friend would not listen to me. He found a JD 1327 Mower-conditioner this spring. I told him to check it over real good before he used it. Well he washed and polished the shiny paint up but did not drain and refill the cutter bar. All was well on the first crop. Second crop he gernaded the cutter bar. With even using some of the old parts that where just "kind" of good he spent over $3000 in parts. He now had just about double in it what it is worth. He could have boughten a newer style with the segmented cutter bar for what he has in it now. Some guys have to really pay for that non-college education. LOL