You really don't want to risk the bearings with an impact driver, but you still need to put it back on with a torque wrench...
I just made a 1.5"x1.25" bushing-style tool, mother fuckers who owned this H22 last need to die in a fire. Bent the bushing AND 1/4" angle iron (welds held ;D), and bolt didn't even budge with me BOUNCING on a 4 FOOT extension. Once I impact'd it out, come to find out there's nary a drop of lube on the threads, contrary to Helm's requirement. Fuck clueless honda owners. /rant
Found out they built a Fastenal less than a mile away, got a pair of "heavy hex nuts" in 1.25" thread size, fits perfect. A regular nut is only 1.875" OD, heavy hex is cunt hair under 2" OD. My grandpa is machining one down to fit in the h22's tight space (and an impact socket just in case), so I'll post pics later. I'll also snap some of my flywheel holder. A real gem when the tranny is removed.