GraryBeard, If you learn to feed from the top you don't have to hold the arm up.
Here's what I do. Loosen the lower clamp, Raise the upper arm with one hand, line up the blade from above with the other hand. let the upper arm with the blade drop into the hole, then tighten the lower blade clamp.
To make it easier to access the lower blade clamp, remove the lower blade guard. It's a thin bar mounted in front of the blade clamp.