Instructables

Step 4: Mark & Pre-punch Holes for Jacks Before Drilling

Mark and pre-punch the positions for drilling the holes on the center-line with an awl or fine marker. Position is not super critical, but should be even if you want your project to look neat.

- Make 4 marks on the long side center line, spaced out by about 3/4 of an inch.

- Make 1 mark on the middle of the center-line on the short side.

- In order to keep the drill from wandering, it's good practice to punch the holes with an automatic punch or awl.

Hint: It's a good idea to put a small piece of wood or a big rubber eraser behind the thin metal to keep it from bending.

 
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