yeah, sometimes aluminum (the head) can be tricky to not strip and especially when cold. Typically, on stuff like this, I use 1/4" drive socket wrench (mine are ss button head, so I use a t-handle hex key) and just put my hand on the wrench by the socket and not the lever, and this seems just about right for proper torque; If I do end up using the handle, I go really light, cause even on a small 1/4" drive handle, it gives it enough leverage to put too much, if you're not careful!
Least you'll have easy access, BUT be sure to lay down some rags and/or put some grease on your drill bit/tap, so you don't get shavings in the engine (assuming you pull cover)...What I do is use a drill bushing (something I made, but you can buy too) to help guide the bit in straight; nothing worse than a crooked hole when you try to tap something /ubbthreads/images/graemlins/grin.gif Nice thing is the hole is already there, so it'll be a good guide, but just go slow.