Lapping Hyper 212+ HDT hsf

[0o0]

Hey guys I know that we're not supposed to lap hdt coolers, and yes if seen the pic on evga forums, but my hyper 212+ is concave by nearly a third of a millimeter ( just guess-timating). I've never actually really lapped anything before (other than my belly on a piece of styrofoam at the pool... but that's a different story), so I'm going to start off this thread with 3 questions:
1. How do I hold a cooler like the hyper 212+? Incase you guys haven't seen it, it's nearly the same as Vendetta 2, Xiggy 1283
2. How much would be a fairly safe lapping amount? Would I be able to lap around half a millimeter without penetration?
3. Which grit(s) of sandpaper, how much of each, and should I put some liquid soap on it as I've heard from other sources?

Thanks for helping out a hwc newb

edit:sorry just realized this is in wrong section... probably should be under 'guides & how-to's' or 'air cooling'... any mods dropping by please move this over, thanks.

Use a thick piece of glass wrapped with sandpaper for starters.. thats how braineater does it. Not sure on the rest though.

[Sushi Warrior]

1 Hold it by the heatpipes near the base.
2 As long as you use smaller grits you shouldn't have to worry about that.
3 I would start at ~600, move to 800 then 1200. I use just water (a couple of drops, no soap).

[0o0]

Alright, I'll try that out. Do you guys think I'd be able to lap off around half a millimeter without busting?

For holding it, I've seen some videos of some guys placing a few fingers between the heatpipes (palm facing down towards base), or do you mean hold it from the outsides of the heatsinks as if I were holding a cup?

Thanks

[Sushi Warrior]

I hold it with one hand per side, holding the heatpipes at the base. Just holding the outside of the heatpipes.