Q. -What do you get when you cross a B.B.Q. with a spark-plug?

Answer: "Scotchs Color-it-Tuned" !

A spark-plug and a BBQ ignitor electrode
 
The two, assembled
 
With an extension
 
Showing transparency
 
 
Couldn't get a great picture but when installed and with the naked eye, it works brilliantly 
 




 

Interesting

How did you connect the igniter to the plug base? Expoxy?

Start by breaking 0ff the ceramic.
 
Grind off the rolled edge
 
Punch-out the remaining ceramic
 
To increase the viewing area, drill out to 13/32"
 
A 7/8" hole saw cuts the 1/2" thick Lexan lens and also leaves a center-hole. Use a nut/bolt as a mandrel so the lens can be mounted in a drill-press
Use a coarse file to turn-down the "lens"
 
Use a FINE file to get the final diameter to within several thou.
 
Apply "crazy glue" to the inner bore and press the lens into the body
 
 
The hole saw center-hole is typically 1/4". Depending on the diameter of the ceramic, enlarge the center-hole if required.
The fit should be as close/snug as possible.  Trying to press the ceramic into a hole too tight may break the ceramic !
Use crazy-glue or epoxy to secure the ceramic.  Note: If using crazy-glue, position the ceramic first ! 
Epoxy allows for positioning and adjusting !
The final depth of the electrode is somewhat arbitrary. The following is what was chosen.  A "Gunson's" is shown for comparison.
 
 
The spark-plug end of the wire electrode (on the spark-plug used) comes flattened and folded over.  Keep this feature !
Wrap the entire length, including the folded end,  with fine wire
The finished winding diameter at the fold-over, must allow the terminal-end to thread on.
Slide a piece of plastic tubing over the wire-wound electrode. This is merely for "build-up". 
A piece of woven insulation is then added.
Shrink-tubing is the final layer. 
 
 
 
 

The wire electrode is S/S so can not be soldered ! 
After the insulation/shrink-tubing has been applied and after the terminal end has been threaded on; put a few drops of crazy glue into the open end of the terminal to secure it to the wire wound electrode.
Final note: The lens material in a "Gunson" is unknown. The "Gunson" instructions infer their lens is a synthetic material.
The same caution therefore applies to this project.
 


















 

You have mad skills, Sir Scotch!