Rounding isn't an issue if you file (or preferably stone) the electrodes
carefully after blasting. Those little blasters do the same thing that
(that portion of) the $1,000 Champion machine does. It's also got something
like a Model T coil inside to functionally spark-test the plugs, and some
pressurize the plug to spark-test it under more realistic conditions. But
it's still a sandblaster.
Now if someone blasts plugs and then screws them right back in without doing
anything else, after a while the plugs get pretty round. But then I'm sure
some guys don't take any care to remove all the blasting grit from a
newly-cleaned plug either.
Used properly, it's a great tool.
Karl
> OK, Karl, I don't know about aircraft plugs and the reconditioners that
> are sold for them. The little sandblaster bags that JC Whitney sold were a
> bad idea.
>
> Yeah, they removed all the crud that your Wankel engine dropped on them (I
> had one of those, too!). But every time you used it, you rounded off the
> edges and weakened the spark...
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