I tried using the spin doctor crank puller on my bike a couple of months ago and despite much straining, I only resulted in stripping threads. ARRRGGG!!! i decided that it was best left alone and i'd take my bike into the shop when i need to remove the cranks.
today i bought a park tool ccp-22. piece of cake! i'm sorry that i ever saw the spin doctor tool. took those cranks off in no time.
the spin doctor crank puller should be illegal!