Here are pictures of an arbor separated from a frame, for those who wondered how things were together.
My Pietta Open Top had a slight wiggle in the arbor.After experimenting with CA glue, which I am sure never had a chance to get in to where it needed to be. I decided to remove the arbor. This may not be a project for the weak of heart. The lock pin was soft and easy to drill out with a definite change when getting down to the hard arbor. (I have done some aircraft rivet work so this is not much different from removing rivets)
Am thinking of using Loctite now as the looseness was very slight. I am just kind of that way about having things"perfect"!