IIRC a while back you outlined a method of checking caster with a camber gauge. IIRC you turn the front wheels 20 degrees one way from center, record the camber measurement, then turn the wheels so they are 20 degrees the other way (a total of 40 degrees from where the first measurement was taken) record that camber measurement, then... what? Drink a beer and wait for an epiphany? 
I was taught it's 30 degrees in both directions, then subtract the smaller camber value from the larger camber value for your caster value. I'd love to get another authority on this.
In reply to Jensenman:
I helped a friend with his Factory Five last weekend. The instructions were; check the camber at 20 degrees in either direction and multiply the (absolute) difference by 1.5 i.e. 1st reading -2, second reading +2.0 = 4x1.5=6 degrees of caster.
Cool. 
Thanks!
Sorry for the delay. God son's 1st Communion. Today we off to eagle scout ceremony! 
My research shows that example above as 4 deg no multiplying. I learned this for the guy who did my 1st alignment on my dwarf with a hunter machine he asked why I'd paid $$ to do a race car. He showed after he was done with the laser heads.
If you got a car with fresh alignment go check it and report back.
Thanks, I'll do that. Eagle Scout, huh? Way to go!
Don't most camber gauges have a caster measureing bubble Mine does. It makes a differnce in how you measure caster. RF wheel, turn it 20 degrees to the left, measure, turn wheel to the right 20 degrees ,measure. Done wrong will give you a false reading. Have seen it happen.
Yup 1st one in a long line of scouts to make Eagle and only 23 from his small town troop in 86 year! I made it to life with 3 merit badges to go and got my licence....had 1.5 to finish and never did. One of my personal failures in life. 
I hang a plumb bob off the tread. and use a tape measure to make sure I've got the right amount of angle. I used a drafting table to check the length but with the radius of the tire you could use math...
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