Sure glad that thing didn't hit you in one of them articles as one of my helper friends said when that happened to another friend while knocking out a master pin from a dozier track with two big hammers.
The best way to change the sections in a sickle blade is to remove it from the machine and place each section down in a vice that is closed almost tight with the blade back pointing up and just strike the section with a big hammer to shear out the rivets. Easy as pie and no danger unless you hit a finger. Helps to have a helper hold the blade in the vice. I bet I've knocked out at least a thousand secitons that way. An old farmer showed me how to do it years ago when I was working in the Ford dealership.