Cracked ceramic plug issues

I thank you both but this arc has only started recently. I am always very careful with the ceramic and if there's ever a question I replace it. It's difficult enough getting at the plugs.as far as a rubber boot inside the socket sometimes I find it very difficult to get the socket off. Usually I don't have the luxury of a full size socket. Had to make a handy plug socket. I can't believe I damaged 3 plugs.3/4 swivel gear wrench does the trick.

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