I like that clutch assembly jig. If I had more Cubs I would make one too. If you are working in a field that jig is a necessity. I had the luxury of working in a garage at home.
I have a feeling the blue spring may have contributed to the driveshaft breaking. You found the weak link when the force went up. My clutch was slipping when I rebuilt it. My brother had the tractor and used it with a locked up throwout bearing. It tore up the release arm and put steps in the drivesahft. I replaced the bearing and arm when I got it along with the disc just to get it running. The bearing would hang up on the steps and not allow the clutch to fully engage.
I was tempted to go with a stronger spring but decided not to. I am not pulling anything heavy and remembered that this tractor would spin the wheels before the clutch would slip. I kept the original spring and have had no problems.
I'll take a look to see if the fuel line is marked up and send you the correct spec. IH didn't use anything exotic on these tractors so I suspect it is a common, easy to find hose.
Don't be discouraged by the condition of your 1200. It will cost you some money now but if you fix it right it will serve you for decades to come. My tractor was given to me by friends in the neighborhood I grew up in. I have known it since new in 1977. It has been a reliable machine for almost 40 years and with a little TLC will serve for 40 more.
My youngest brother had my 1000 for 4 years and I was sick when I saw it. He drove it into the ground and wasn't running when I got it back. The clutch was the most expensive repair I had to do to it. I did a band-aid repair initially then fixed it right. My advice is do it right and you won't have to do it again.
I really wish my neighbors bought a 1200 new. They had a 122 as well and the additional 2 HP made a difference. The 1000 reminds me of them every time I get on it and I wouldn't sell it for anything.
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