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PCB CNC Mill: Clamping makes a difference

This might be useful to anyone else here with a DIY CNC who does PCB milling: http://blog.holyscraphotsprings.com/2011/05/good-circuit-boards-require-good.html

I've had a really tough time figuring out how to clamp my PCBs: my boards often look like the "bad PCB" here: http://www.flickr.com/photos/11461247@N02/5697373918/

Why did my soldering iron explode?

I just replaced the tip of my TC201 iron (on a WTCPS soldering station), with a new PTA8 tip, and went downstairs to get some coffee.  *BANG*  I ran upstairs to see what had happened and found my soldering iron laying across the workbench a half meter away from the soldering station (not on the stand), and frantic investigation located the PTA8 tip near the station (it bounced off the stand) and the copper insert (the heat-conducting element) a quarter meter away from the soldering station.

So why did my soldering iron's tip explosively separate?  What the heck?