To all of you that are misconstrued about the whole argument about single -> double and double -> single. It's easy, actually.
Double to single comprises of first detaching the driveshaft, taking the spring assembly off, putting it to the slave, taking the beater off, putting it on the slave, and taking the extra post off of the main.
Single to double comprises of doing the opposite, in the EXACT opposite order, ideally.
And if you want to get creative, it will also convert to a lefty double. Just takes tinkering. I've done it in the GC by my work, and I sat with it for nearly 40 minutes, converting it every which way. The only thing I wish it had on top was a resistance setting similar to those of the Trick Pro-1V, but hey, no one's perfect. For the price, I'd very much recommend it. I got mine shortly after I tinkered with it, and if I could find my camera and stop using the internet at work, I'd post pics step by step how to convert.
Btw, youtube is great. There's probably a vid detailing it. I can't find one, but the Pearl website has videos detailing how to convert on the product information page for the double pedal.
HOPE I HELPED.