I just ordered one from my local auto parts place. They
said they will match the $45 Amazon price, no shipping,
3.8% sales tax, should have it next week.
“
KD Back-Tap 14mm Internal Spark Plug Rethread Tool.
Patented design allows for chasing spark plug threads
from inside the cylinder head and working outward.
This tool uses the better threads at the base of the
spark plug port and greatly reduces the chance of debris
falling into the cylinder. Works on 14mm spark plug
threads. Length of 6" allows for deep well plugs. Tool
can be used with 1/2" socket or wrench. Availability: In
stock Usually ships within 24 hours. Ships via UPS.”
They say it is 6" long.
Next week I’ll take some pictures using it on a disassembled
head and try it on a complete engine. One issue with a 911
is that it make the turn and fit down the sparkplug opening
and clear the chassis without removing the intake valve cover.
This looks like a tool that belongs in everyone’s tool box. I’m
going to see if it is suitable for regular sparkplug thread
maintenance. This has always been a difficult issue.
Perhaps it is somewhat solved.
Best,
Grady