Roll joint removal

[Steiner]

Is there a trick to removing the roll joint? I’m taking one out of a “donor” and am getting hung up on the rear side lug. I was able to tap it most of the way out but can’t keep the rear lug lined up with the channel to get it completely out. For informational purposes, I bought the "El Cheapo" a few weeks ago explicitly for the oportunity to help with the work on it. Looks like a replacement joint roll will take care of the lack of tightness and some adjustment to the ejectors and this will be a great gun.