Yet another case back opening tool!

My new case back opening tool. There comes a time when messing around with various implements to open a snap back that just won't play ball, becomes painful. I seem to have collected a shed load of back openers, from the humble rubber pool ball, to a pretty major over engineered screw back opener...and I use them all! Opening a watch case is a daily job, so these are pretty essential tools. Unfortunately, there are various ways of opening case backs, so a single tool is not an option.