Henri, two ways to fix that.
1. Grind off the welds on the ends of the rod where they pass through the QA bracket, remove rod, remove pulley brackets from old rod, replace with a new section of 1/2" rod, be sure to drill the holes for the roll pins in the proper locations. Then weld the new rod assembly into the QA bracket. (Best option in my opinion)
OR
2. Slide the pulley bracket(s) off to the side and weld up the groove that is worn into the rod, file and/or grind the weld down so that the pulley bracket can slide over it. Redrill the hole for the roll pin if it was welded shut then replace the pulley bracket and install a new roll pin.
I did the #1 procedure to one of my narrow frame QA mule drive assemblies but I also had to repair one of the pulley brackets. I didn't care about cosmetics just used what I had on hand. I also used a hairpin clip inplace of the roll pin just because I had one on hand. My mule drive bracket has also been beefed up the front of the mule drive with a section of angle iron, this mod was done by my father about 30 years ago. Ummmm it might have been after I ran the 125 into a stump or something and bent it, I forget, no one saw me do it and you can't prove a thing.
1. Grind off the welds on the ends of the rod where they pass through the QA bracket, remove rod, remove pulley brackets from old rod, replace with a new section of 1/2" rod, be sure to drill the holes for the roll pins in the proper locations. Then weld the new rod assembly into the QA bracket. (Best option in my opinion)
OR
2. Slide the pulley bracket(s) off to the side and weld up the groove that is worn into the rod, file and/or grind the weld down so that the pulley bracket can slide over it. Redrill the hole for the roll pin if it was welded shut then replace the pulley bracket and install a new roll pin.
I did the #1 procedure to one of my narrow frame QA mule drive assemblies but I also had to repair one of the pulley brackets. I didn't care about cosmetics just used what I had on hand. I also used a hairpin clip inplace of the roll pin just because I had one on hand. My mule drive bracket has also been beefed up the front of the mule drive with a section of angle iron, this mod was done by my father about 30 years ago. Ummmm it might have been after I ran the 125 into a stump or something and bent it, I forget, no one saw me do it and you can't prove a thing.