Well, I was hoping I could get someone to do a write-up but here are some pictures that might help you see what's going on. It's really easy to do.
Spacer install
I did this last week and so far I'm happy with it. I will probably end up making some that will do the same thing only they'll look better. The washers function just fine but I have the stuff to do it and I'm dorky like that so....... <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>