Was that on the treble side bushing? and i cant see anywhere for the ground to come out, maybe its tucked up real tight in the F Hole block? that will teach me for being a smart butt and not checking just assuming because i had done it before.

I think i will make myself a jig like that one, may never use it again but someday someones going to ask me to take out a bushing

I would use a bit more than paper towel under it though