Hey, I'm not picky.... I just like breaking things.
Here's a link to the writeup I did for a Red Alien a while back (I needed the springs for a prototype cam I'm working on, so figured I'd break it before taking it apart), so if you're actually interested this is what it'll look like: http://www.rockclimbing.com/cgi-bin/forum/gforum.cgi?post=1888810#1888810
One side note is that it looks like they riveted the axle rather than using a nut on the end, so disassembly might not go as easily as with the Alien. I'll get it apart one way or another though....
Oh, and the crack simulator fixture can accommodate anything up through #12 Valley Giants, so size makes no difference to me.
EDIT- Just occurred to me that a people here might not know about my pulltesters since I only started lurking here recently and mostly hang out at RC.... There's 2 pull testers; one beefy and one not-so-beefy. The beefy one will do up to ~44kN with 5" of stroke and is perfect for hard goods like cams, biners and rap rings. The not-so-beefy puller has around 36" of stroke at ~27kN of force (more stroke available at a lower peak force) and is great for soft goods and knot testing. Both do quasi-static pulls using a hydraulic hand pump and utilize a Daytronic 4077 strain gage indicator attached to a 10,000 lb-force s-beam load cell sampling at 1000 samples/second. Yeah, I'm a geek.