Why not. When I decided to try and tap my own steering box for hydro, I kinda messed up the first hole. I started the hole in the right spot, but angled the bit a little in the wrong direction and didn't hit the passage very well. So I figured since I have a spare box I can clean up if I need to, I had nothing to lose to try and fix my mistake. So I backed the drill out and drilled back into the same hole at a different angle. Obviously things got a bit oblong, but it tapped fine. The fitting screws right into it nice and securely, but there was a bit of a gap left that caused for some leakage. So I cleaned things out, got the fitting barely threaded in, slopped some JB Weld on it, and tightened it up. I'll have to see how it holds, but I think it should be fine. At least I didn't screw up my friends box when I tapped his.