Drilling 21mm Hole For Tap Shank, How Do U Do It?

[ben_sa]

One tip ill give is Be 100% certain your only going to want two taps. I drilled for 3. But now realise i could have gone for 4 taps. Once the first hole is drilled... Your committed. Of course, i did get around this by using a bronco... BUUUUUT 4 perlicks would have looked PORN! Oh well. Gives me a reason to plan my next fridge/keezer