The way I learned to do it, was to straighten the cotter pin enough, where one end forms a hook that wraps completely around the first pin. The remainder of the cotter pin, makes a diaganal, from the bottom of the first pin, to the top of the second pin. The remainder of the cotter pin wraps around the second pin, almost forming a figure 8. No cutting involved, and the Stihl bar fits the Husky pins, just as if an adapter was used.
I have have the Stihl to Husky adapters, but can never seem to find one when I need it. This cotter pin adapter works just as well, and can also be used to adapt the Stihl bars to other old saws.
There is a youtuber called, Buckin Billy Ray, that I have seen use this trick, I will look for a link. I found a link for you, the technique is mentioned and demonstrated at approximately 8:50 into the youtube.
Bob
Thank you. I have some cotter pins but not sure they are long enough.