(ET) mower arms information

Monty McGraw was kind enough to post a picture and parts list to answer my question about how to assemble a front mounted mower arm. It's clear from the diagram and parts list that there is indeed a 1/4" x 15/16" roll pin pressed through the shaft to retain it in the outer cylinder. Today I met with another list member to find some parts, and in examining a few arms in his collection and mine, we find the hole through the shaft (in the position indicated in the diagram) was no where near 1/4". In fact it appeared to be about big enough for a slim cotter pin. So apparently there was an "early version" which had a much smaller pin, and a later version which had the 1/4" pin. I am sure I'll be able to figure out how to deal with my arms (drill the hole larger!), but just thought I'd share this bit of trivia with the group.