Drilling Considerations

• Bowling balls are very customizable items, since the way a ball behaves on the lane after it's thrown depends on the drilling techniques used. Most of the customization takes place at the drilling stage. First, the driller measures the bowler's hand. This is important because the finger holes will differ in size, and the distance between the holes will vary based on the width of the bowler's palm. A proper, experienced driller will consider the ball's center of gravity, the material used to create the ball's core and the ball's actual surface.
  
  

Proper Measurement

• Your ball driller will need to attain the following measurements to give you the best grip possible:
  
  1. The size of the holes and the distance between them. The distance between the nearest edge of the thumb hole and the edge of the finger holes is what to look for.
  The span will vary, depending on the type of grip you prefer. The thumb must be fully inserted (up to the web), but the fingers will only need to be inserted to the depth normal for your preferred grip.
  2. The alignment of the holes is important in relation to the center line, as are the direction and degree of each hole's pitch. Holes are pitched, or angled, to provide a grip that allows a bowler to give the ball some lift upon release.
  Forward pitch in the finger holes will cause the fingers to remain in the holes longer and lift with greater force and shift weight to the fingers.
  Forward pitch in the thumb hole will give that digit more of the ball's weight. Reversing the pitch will let the thumb release quicker and apply less drag.
  
  

About Technique

• The MoRich Bowling Ball Drilling Company has developed two techniques that they use based on the skill level of the bowler and their personal preferences. The Dual Angle Layout technique is the most common, as it is meant to give bowlers the best chance of success, regardless of lane conditions. The Double Thumb Drilling technique is recommended for those looking to give their bowling balls strong, dynamic movement. Both techniques consider the drilling angle, the pin to positive axis point, and the angle between the pin to positive axis point line and the vertical axis line.