This is something I read a few months ago. Seems worth posting now:
WDT or the Weiss Distribution Technique to improve espresso extractions.
www.meticulist.net
I think if I were to try this, I would play around with a wine cork and some paperclips.
Similar to this:
This crafty person used cleaning tips for a 3d printer, drilled the cork and epoxy to hold them in place.
I would probably just use 5 paperclips straightened and cut to size, putting the cut end into the cork and the smooth end exposed.
Might be fun to play with just for kicks.