Paul: The angle in both photos is not quite right. On the back side of the rockshaft arm that raises the rear lift is a cast tab for a pin to go through. On most non fast hitch tractors that tab has a 1/4" hole, however on the fast hitch tractors the tab is larger with a hole for a 1/2" pin required for spring assist to hook to.
I have run fast hitches without the spring, they lift marginally less, however I think the long term effect of no spring will be detrimental to the tractor hydraulic system.
The problem for you will be finding a rockshaft arm with the large hole. Then you have to dismantle the rockshaft arm assembly. These can be a real bear to get apart. A good option may be find a complete touch control unit. This of course would be more feasable should your current touch control unit need a rebuild kit.
I had been thinking if you sent me an e mail I could retuen photos of the fast hitch spring. I think I know the problem your having, your using modern and I classic. Using classic forum click on your post then scroll to my post, at the bottom click on send mail. I think this is one of the YT pitfalls if one guy is using modern and the other classic.
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