For a lot of years I kept a piece of 3/8-16 all thread about 3 inches long in my tool box with two nuts jammed together on one end and 1/2" of threads ground off the business end. The last few threads of that hole get gummed up with sludge since the bolt plugging the hole doesn't extend that far. No telling how many fuel pumps I changed using that tool.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!