The smooth dome cap unscrewed just like the hex version, no problem. The pin, spring and ball were perfect, well lubricated. Unfortunately the slots in the turret looked like someone had taken a chainsaw to them.
Permanent fix will require either filing out the eroded slots to a bigger width and milling a large bush to fit in the larger slot, or adding material and filing back to original size. I’m thinking that JB weld won’t last very long under that abuse.
Anyway, I fitted some temporary bronze bushes for the moment which removed most of the slop.
Thank you again for your help.
Jake
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