[EricH]

Originally Posted by Sohaib

Sorry but I'm not sure exactly what you mean by "center punch the hole centres" - if you could tell me that'd be great!

You know how to center punch a hole, right? (Explanation below, just in case you don't.) You apply the center punch at the center of the holes you want to drill. In this case, they're using the paper to mark the centers and then using the punch to transfer the mark.


Use of center punch (looks something like a metal stick with a sharp pointy end):
1) Put sharp point on exact center of hole you want drilled (use eyes to position).
2) If it's springloaded, hold perpendicular to the part you are punching and push straight down until it "snaps" (you'll feel it pop or snap or what-have-you). If it's not springloaded, hold perpendicular to the part your are punching and hit with a hammer ONCE.
3) Remove center punch from part and verify that that nice shiny ding in the part is in fact in the exact center of where you want the hole drilled. If it is, or is "close enough", go find the drill bit you want to use and a drill. If it isn't, repeat until it is.