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There are 3 separate processes that have to be achieved in order to drill a ball for a bowler. First, we need the measurements for the bowler’s hand, whether that is copying previous measurements, or taking new ones (see chapter – Fitting). Second, we need t...

Milling machine / Drill press - Make sure it's clean when you start the job and that the pitches have been calibrated Drill bits - Make sure they have been sharpened recently Ruler - Span ruler that is accurate to at least 1/16" - Having a post to secure it ...

1)      Draw centre line and midline of grip 2)      Dividing the span of the middle finger in half, draw the span line for the middle                 finger and ring fingers 3)      Draw bridge lines 4)      Select the correct drill bit for the middle fi...

1 1)    Draw center line and midline of grip    2)    Dividing the span of the middle finger in half, draw the span line for the thumb hole              3)    Select correct drill bit for the thumb hole       4)    Set the correct pitches   5)    Align th...