thats where your crystals go!
![Cheesy :D](http://forums.sohc4.net/Smileys/default/cheesy.gif)
(find a craft store and get yourself a nice shiney plastic one, and drill out the bottom of it to fit over a small LED you wire in as a Neutral or oil light.)
or, you could rout it out to fit one of those shiney new SOHC4 pins, fill in with self-levelling 2part epoxy, sand flush, polish, and then clear over.