A piece of black, rubbery foam, rolled up, about 1" wide, cut a bit oversize...inserted into the deep end of the socket, it'll suffice as a "grab mechanism".
With the right thickness rubber (1/2 or 3/4) you could cut a tiny donut that would do the job..instead of rolling a piece. Be inventive. Use scissors, an exacto knife, single edged razor blade (OMG be careful please) whatever works for you.......
Experiment a bit (apply some inventive initiative) once you've sized it...use rubber cement to hold your donut device securely in place, deep inside the socket.
You can do this on the bench or kitchen table...using a loose spark plug and the socket in hand to easily check its ability to grab.
Ideally, with about 1/2" to 3/4" depth with the donut hole creating some interference fit over the plug tip and ceramic, it'll automatically, gently grab the plug to hold, pull out with gentle persuation, but not affecting full socket insertion and loosening at all... afterwards, the rubber is still glued, adhering to the plug wall allowing use over and over. If it breaks out, more glue, make another. Done right, it'll last.
That 18 is not a dedicated spark plug socket (they have a rubber grab device already installed) .....but no biggie...this a very simple DIY.
In the end, what you've done is just what a factory does...transform a "standard" socket into a dedicated "spark plug socket" with a cheap ole' piece o' rubbery foam.
“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson
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Last edited by ducatiman; 12-15-2018 at 6:34 PM.