I’ve always struggled boring accurate holes with hand tools. I’ve tried using the “CD trick”. I tried try-squares and mirrors. I get close, but sometimes close isn’t good enough. That’s when I came up with this simple trick (I’m sure I wasn’t the first one to use it): a guide block.
I first came up with this while drilling the draw-bore holes through the side of my top. I have a drill press, but there was no way I could get the bench-top under the press. Now, I’m using it to start my holdfast holes.
Here’s how I made it:
- Find a piece of scrap that’s at least twice as thick as your hole and long enough to accept a clamp on either side of the hole.
- Joint an edge. This will be the bottom of your guide.
- With the jointed edge down, bore your hole roughly through the middle of the opposite edge on a drill press (the table must be square to the bit).
You’re done. I marked arrows on all four sides of mine to remind me which way to orient the guide. A wider piece will yield more accurate holes, but may be harder to clamp to your work piece.