1. Draw an arc 4″ from the center of the Pin.

2. Draw a second arc 4″ from the center of the Preferred Spin Axis (PSA) that intersects the first arc from step 1. Where these arcs intersect is your bowler’s Positive Axis Point (PAP).

3. Now that you have found the PAP location, you need to find the Pin Buffer. In this example, use a 2″ Pin Buffer. Draw a second arc 2″ from the Pin. PSA Drilling Instructions 4″ x 4″ x 2″ Example 

4. Draw a line through the point where the arcs from steps 1 and 2 intersect (PAP). This line should be tangent* to the Pin Buffer. This line is your bowler’s Vertical Axis Line (VAL). * Tangent: line which only touches the Pin Buffer in one location.

5. Using the VAL from step 4, measure your bowler’s PAP backwards. This example uses a PAP measured as 5″
over x ¾” up. Measure ¾” down from PAP on the VAL and make a tick mark.

6. Use your bowler’s span measurements to draw a line perpendicular to the
VAL. This is the midline. Using the PAP, measure 5″ backward on the midline
and make a second tick mark. This mark will become the center of grip.

7. Using the tick mark from step 6, draw a line perpendicular to the midline. This line is the centerline.

8. If the Pin will be within 1″ of the nearest hole, it is necessary to shift the center of grip to either drill the Pin out or increase the distance beyond 1″ in order to
meet the manufacturer’s warranty requirements. For full manufacturer’s warranty, see back cover.

• High flaring, strong layout This layout creates a very strong flare potential giving you a lot of potential entry angle. Very strong layout for most players. 
• This layout is good for multiple styles and a variety of patterns. It is a very versatile layout. 
• It creates a very strong entry angle due to it being a very high flaring layout. 

• This layout will provide easy length on most patterns
• It was also give most styles a late midlane read
• Control type of layout when you need your ball to be controllable
• Very useful for most styles on low oil volume patterns or wet/dry conditions

• The 4x4x3 PSA layout will provide a strong reaction for most players
• Very useful layout for strokers & tweeners who need the ball to rev up quicker
• Starts early with sweeping arc to the pocket

• Gets the bowling ball very easy through the front part of the lane
• Gives you a solid midlane read when the bowling ball starts to transition 
• Provides a consistent and strong backend reaction
• Great for multiple conditions and oil patterns and a variety of players

This layout from Storm provides a good combination of length & backend
• Very controllable reaction on the ball for most styles of player
• Late midlane hook and controllable

This is a very strong layout to put on the bowling ball
It is a great layout for long patterns
Not recommended for crankers or extremely high track players

Strongest layout for full roller
• Strong arcing motion
• Works best with 3 – 4″ pins
• For more reaction, drill fingers deep and for less reaction, drill thumb deep
• Make sure to stay within USBC specifications for static weights