This worked. It probably would not have been necessary if I'd removed the glow plug! I guess if one bought the tool and legitimately could not get the prechamber removed after one attempt, then I'd epoxy since the tool is probably damaged too at this point.

Getting older and I am clearly going to have to become super methodical with notes. Did a test removal on older car and took the plug out first. Thought I'd done so on this car. In my defense the glow plug wire was attached with a much smaller nut (nut built into harness missing). I am still shaking my head on this.

Didn't notice the glow plug issue until I had the intake manifold off. Replacing shutoff valve today and putting back together. May the maker help me from another Mr. Magoo foul up.