Revelation Travel Change Via Spacers How?

Hey guys, ive got some 2010 Revelation Dual Air Races, and at present they are at 140mm, now i know you can remove the spacer to increase to 150mm which is what im looking at doing..But either im as blind as a bat or it doesnt exist, i cant find any sort of guide on how to do this nor what tools and other things i would need for the process.
If anyone can shed some light on this it would be most appreciated.
If anyone can shed some light on this it would be most appreciated.
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http://www.sram.com/_media/pdf/rockshox/dealers/TM_MY10.pdf