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There are (were?) non-metallic "diddle sticks" (adjustment tools) available. Since I haven't needed to buy one in decades, I'm not sure where to look for them.
A warning - you apparently did OK wiht your adjustment, but it is typical for the cores in old coils to stick and crack when you try to adjust them with more than a tiny amount of force. That can be a real pain if you don't have replacement cores. (Even worse, the coil form may get brittle with age and crack, and then there is no hope without an exact replacement.)
I wonder if someone here with practical experience can suggest if it's possible to lube the core with something prior to adjusting?
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