Scary steering shaft/coupler failure!

It's at the top and is designed to keep the shoes from coming out of the coupler.
is it the "dowel pin hole" referenced in Dave69's pic at edge of coupler? Im looking at 2 in my stash (64 and a 4/65) and neither have that. maybe it as a running change later? It would make sense to put one there, but maybe something a little bigger. I like the wire cage thing. will have to get one.

Blamo, Jim Lusk and Sedanman for the win! Earlier models do not have this hole...
coupler2.jpg notch.jpg