I think the roll pin is just less than 1/4 inch cause it is metric. If you go to messicks.com website you can down load the parts diagram for the drive shaft. The guy at messicks told me that the last digits of the part number is the actual metric size. They cost only around a $1.20 a piece. Getting the right roll pin punch was the hard part. I tool a new one to the local hardware store and match one as close as possible and it worked fine.
Good Luck evan4434. Take some pictures, we would like to see your repair progress.
Good Luck evan4434. Take some pictures, we would like to see your repair progress.