Adapter for inductive timing light for use with shielded spark plugs.

[teletech]

I wanted to measure my timing with a light but of course the wires make that difficult.  I turned a bit of plastic and ran a section of threaded rod up the middle, worked great.  .5" dia inside the plug and recessed on top for .8" of length, then a .3" dia section for the light about an inch long.

Before that I had to have a friend hold a screwdriver in the circuit with the clamp around it, not as satisfactory... but amusing.