What hardware is everyone using for auto-lubing.

Are the ways lubed only once per startup, or are they lubed at timed intervals?

What do I look for, for an X2 type machine?

Is air pressure used to move the lube or does the hardware have some sort of internal motor or solenoid to push the lube.

The best (and simplist) I've seen is a typical one-shot lube system with a spring-loaded plunger pump that you pull up, and it slowly retracts back down, pumping lube to the ways & screws. I've seen this setup put on Bridgeports, mostly.

Here's a cheap one:
http://cgi.ebay.com/Bijur-Lubricator-Pump-Unit-Auto-Lube-No-Reserve_W0QQitemZ260234867673QQihZ016QQcategoryZ57013QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

What do the Seig Super X4+ use as lubing machanics?