dont try that trick when working on a car starter motor... but if you are interested... ground ring on any metal part of car near starter, then move ring towards the + post of the solinoid while keeping ring firmly in contact with metal of any other part. When contact occurs with + post , look for lots of sparks and glowing red ring, yank hand hard from area and start bleeding profusely...
which is why my mechanic hubby never wears his lol... actually he refuses to wear any metal.. especially belt buckles, but they're because they can scratch the crap out of a paint job.