Yea- I did the same.In my case...if you search this site the first and only how to that comes up is the one that recommends doing so.
I figured out you didn't have to after the fact.
I vaguely remember the arms extending past the rivets for some odd reason (I think the PO had bend the ends during the previous replacement?)- so for me- having the bolt and screw gave me the piece of mind that they would no longer go past the point. Ever. Again.