We've had this happen on our M3, F3 etc. You may alleviate some of the problem by raising the cylinder. Ideally the cobs should exit the cylinder whole. Now that is in a perfect world, some harder to shell or softer cob hybrids make this easier said than done. It's a balancing act between getting off all the kernels and grinding the cobs.
The pan comes out fairly easy, first take out the 5/8" bolts on each side of the front of the pan. They run through the shaker arms that move the shoe. It helps to have someone help you as you need to crawl on the chaffer to hold the bolt heads while your helper takes off the nut and lock washer. Then they can drive the bolt out to you on the inside. Repeat for the other side. You can sort of lift the pan with your back or shoulder when you reassemble to line up the bolt holes. It's kind of a pain, just hope you haven't been running itch berries (Milo) when you have to do this! Then unbolt the bar that holds the back of the pan up. I think there are 2 3/8" bolts per side, going from memory. The second person comes in hand here as well to hold up the pan. Then each take a side, let the back end down and slide it out exposing the walkers.
Gleaner used to have a kit for installing the wires in the walker. Not sure if they are still available, they used some wire clips to hold the wires in place. We have used #9 wire, 3/16" Tig welding rods, etc. We just wired them in securely with mechanics wire, it's thin and is easy to tie.
Hope this helps you out, if anyone has more tricks I'm sure they'll add them. Good luck!