Mine had two friction discs and two triangle springs, it's a late production 129. Seems like the manual says you can use two friction discs on HD applications, mine had two when I bought it, so I put two back in it.
Mine didn't stop the PTO well until I replaced the brake lining on the PTO arm, it also brought the adjustment on the actuating rod back into range.
Once you figger it out you will smack your head, I was trying to make it harder than it really was, works like a regular mechanical clutch, the center button is like a throwout bearing.
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