Thanks for all the tips, info and input! I'll have to do it tomorrow, been raining all day. I think I'm just going to eye it up, the gauge actually seems like it might be distracting trying to keep it still and all. Maybe I'll try it on the first round to see what it's like. I think I'll also try the set mark or paint dots on the bolt heads, seems quick enough to set up and real handy reference-wise.