I was thinking about that as well. I`ve removed two bushings out of leaf springs, and both of them had the bolt rusted solid to the inner sleeve.Up in the north the bolt and metal sleeve always hold moisture and rust together. this should work better at keeping the sqeaks to a min though.
can i just add the zerk fitting to my diy flip and shakle hanger i had the idea after seeing these on youre site a while back and then now you offer it that way. is the bushing the same or special.