Ok I found the article. The new hole isn't quite near the center of the center ring like I thought. It's still inside the machined ring inside the shock cap but the hole is towards the outer edge of the ring. They say to use a #56 drill bit.
RC-Car Magazine June 2009 Volume 12 No. 6 back on page 96 and 97.
If no one has posted pics by the time I get home from work tonight I'll scan this article and post it up.