I have to replace one as well, probably do both if the first goes well. From what I have seen is it would likely hurt seed placement somewhat. It seems to flex moreso when lifting the wings.
I used too work at the factory. The ones in the green circles except the last row were just a see bushing that was hit in. It was an alligator type that you would press together with a vice grip and tap in. The rear bar had a bearing that would be put in when the drill was set up. The large pins on the rock shaft have been modified. They should just have a washer with a snap ring and not be welded. The bushings were a woven nylon self lubricating bushing.Sorry yes it is the one closest to the back circled in green, looking in the parts book it is listed as bushing tension ext. groove 2.25 OD and bushing spherical 2”od x1.25 sealed so I think that sounds like a bearing to me! The hinge pin assembly circled in red all appear to be new, I had a quick peek tonight as it was getting dark and I can’t really tell if there is much slop or play in there how would I check those to make sure? I did however note the pins are welded to I’m guessing washers or the bushing itself?
Thanks for all the reply’s I feel I am heading in some sort of direction now!
What would the part the red be called is it a hinge or what