On 1 Dec 2003 03:56:44 -0800, (Michael Horowitz)
wrote:

I'm trying to adjust the sparkplug gap with a borrowed sparkplug vice.
How do you open the gap if you've made it too small? - Mike

I am assuming you are using massive electrode plugs.
If it is just a little too small leave it alone and it will get bigger
in a hundred hours. If it is a lot too small you are screwed so mark
this off to education expense. If you try to open it up by pushing
against the center electrode you may crack the ceramic and have an
intermittent miss fire that WILL be hard to find. Sometimes this can
be found with a high pressure spark plug tester some times not.
I like the screw on collar with the two wing screws for adjusting the
gap. For me this works better than the high priced champion unit.