How Do You Remove the Center of a 5/8" Spark Plug?

[Tom Wesenberg]

I need to make a grease fitting adaptor to a 14mm spark plug, so I can hopefully use a grease gun to push a stuck piston in a Power Products engine.
It was easy to snap the upper part of the plug off, but I can't even chip the rest of it inside the metal body.
I bought two of these adaptors at AutoZone for just under $4, but still would like to knock out the centers of a couple of old 5/8" plugs.

SPARK PLUG NON-FOULER 14mm with copper washer... stop plug from fouling!!

Here's the link to one on ebay.

http://www.ebay.com/itm/SPARK-PLUG-NON-FOULER-14mm-with-copper-washer-stop-plug-from-fouling-/362088841788?hash=item544e2d423c:g:SWMAAOSw~4NZqWYH&vxp=mtr

[Mitch]

Tom i usually screw the plug into an old head and then punch the center through. Wear googles as the porcelain can splinter and get into your eyes

[Big hammer]

Long sleeves and a chest protector
maybe a press would be a better choice!
I should have stated first with a really Big Hammer

[DaWizard]

I am so disappointed. From you I expected a "not a tappity tap, but a TAP TAP".

[BILL WILLIAMSON]

Wiz,
The "TAP-TAP-TAP" wuz MY thing!!!
Bill Littlehammer

[Tom Wesenberg]

Long sleeves and a chest protector
maybe a press would be a better choice!
I should have stated first with a really Big Hammer

A few years ago I was using my 20 ton press to install an original impellor onto a new stainless water pump shaft, and that thing exploded, sending pieces all over the garage. From not on I'll buy the shaft with the new impellor installed.

[Tom Wesenberg]

OK, the spark plug has a 14mm x 1.25 thread, and after doing some ebay research I found that thread is also used on some German wheel lug bolts, some bicycle pedals, some wheel studs, and some oil pan drain plugs. I just ordered 4 of these magnetic drain plugs, so I should be set for my projects, but I still want to remove a few centers from the spark plugs. Hate to get beat by a spark plug, so I might try the press.

http://www.ebay.com/itm/M14-1-25-Colorful-Magnetic-Oil-Drain-Plug-Bolt-Sump-Nut-Aluminum-3-4x2cm/263152973716?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649