Mark, thanks for you thorough treatment of the Impeller roll pin replacement. I studied and agonized over it for two days before finding your answer above to another customer. After a quick view of the chute removal solution for access to the pins, I decided not to dismantle anything. I drilled a 3/8" hole in the impeller cowl, directly over the roll pin holes. A piece of 1/4" steel rod served nicely for a drift punch, and the pin remnants were out on less than a minute. I purchased two 1/4" X 1 1/2" roll pins at the local Cal Ranch store for $.45 each. Then I drilled a 1/4" hole through a 1" piece of oak dowel I found in my shop, and aligned the pins and the punch in the dowel to install the new pins - about three minutes with no problems. Now I have a question for you:
Should I plug the hole in the impeller cowl, or do you think it will make any difference in the performance of the snow thrower? I'm not worried about rust, as the interior of the cowl has been scoured by gravel and debris for several years and is almost paint-free.
Thanks for your help. It led me to a solution that saved a ton of money and time.