Here are the new rollers and the new Bellcrank assembly. Many thanks to Forum member and coal burner GregWhite for doing the machine work.
Greg took the old shaft, cut off the worn end, saving the end with the ratchet-wheel, made an entirely new bracket, new brass bushings, and a bellcrank end with sleeve to fit over the old shaft, Awsome job!! For the push-pull bar that connects the pin on the bellcrank arm to the grate-drawer under the firepot, Greg rebushed the egg-shaped holes with a brass bushing, and made new [round] pins to install.. Heck of a job..
If you look at the worn shaft in forground of the photo, you can see the notch worn in the shaft, this happened after the original brass bushing wore in two, so the contact was steel to steel. With the frozen grate rollers, this boiler must have sounded like a horror film sound-effects when it was running..