AIR CRAFT SPARK PLUG TWIST A GAP, AND SPREADER

FORM 24 (ss. 21,31,34 and 142) In a tool for adjusting aircraft shielded or non-shielded, four prong or two prong plug, that is used in gas field compressor engines. It has been known to use pliers and feeler gauges and wire gauges to set spark plug gaps for new or used plugs. However, in this invention, we simply screw on a hand nut which centers over the vertical center electrodes, at the same time a tapered bevel surrounds the outside electrodes, 4 or 2 of them, squeezing the outer electrode toward the center. With different sizes of center barrel this tool can set spark plugs accurately ...