It's not your lightning bolt that's so bad.
It's the squiggle you need to make which, to me, doesn't look like a lightning bolt at all.

go to
http://www.potterskeys.com/modules.php?name=Site_Map
and scroll down, more than half-way down the page.
You'll find a picture of it.

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They changed the page, so this link doesn't work.
It's probably around there somewhere,
but I have a headache and don't feel like looking for it.