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Click here to download a pdf of the Symmetric Drilling Instructions
Illustrations shown are for Right-Handed Bowlers. Please reverse for Left-Handed
Bowlers Symmetric Core Drilling Instructions
Hammer performance bowling balls featuring symmetric cores provide strong hook
motion and excellent versatility using simple layout techniques. However, it is
very important that the ball be drilled using the proper layout with the pin relative
to the bowler’s positive axis point. Keep in mind that the placement of the center
of gravity will have a relatively insignificant affect to the overall ball motion.
Tuning Ball Motion:
The coverstocks used on Hammer performance bowling balls will provide good length
and strong backend reaction. However, it is important to keep in mind that all
bowlers have different needs. Hammer coverstocks can easily be sanded to a rougher
grit for stronger hook motion.
Ball Care:
It is imperative to maintain your new Hammer performance bowling ball by cleaning
the coverstock immediately after each bowling session using bowling ball cleaning
products designed for reactive balls. Hammer highly recommends powerhouse energizer
ball cleaner applied with a microfiber towel to remove the dirt and oil from the
surface of the ball.
Drilling #1 - Standard Layout
Ball Motion: Length with aggressive backend
Lane Condition: Medium to Heavy Oil
Flare Potential: Medium
Pin Placement: Place pin at 4¬?‚Äù from the positive axis point (PAP)
Balance Hole: If needed, place balance hole at 4 - 5” from the center of span
on a line through the center of gravity.
Drilling #2 - Length Layout
Ball Motion: Length with less total hook
Lane Condition: Light to Medium Oil
Flare Potential: Low
Pin Placement: Place pin at 5 - 5¬?‚Äù from the positive axis point (PAP)
Balance Hole: If needed, place balance hole at 4 - 5” from the center of span
on a line through the center of gravity. 
Drilling #3 - Strong Layout
Ball Motion: Strong and controllable hook
Lane Condition: Heavy Oil
Flare Potential: High
Pin Placement: Place pin at 3¬?‚Äù - 4‚Äù from the positive axis point (PAP)
Balance Hole: If needed, place balance hole at 4 - 5” from the center of span
on a line through the center of gravity. 
Drilling #4 - Low RG Layout
Ball Motion: E arly hook with smooth arc
Lane Condition: Fresh backends and Wet/Dry
Flare Potential: Low
Pin Placement: Place pin at 1 - 2” from the positive axis point (PAP)
Balance Hole: If needed, place balance hole at 4 - 5” from the center of span
on a line through the center of gravity. 
Drilling #5 - Full-Roller Layout
Full-Roller Ball Track Only!
Ball Motion: Strong arc
Lane Condition: Medium to Heavy Oil
Flare Potential: Medium
Pin Placement: Place pin at 3¬?‚Äù from the center of the span located in 7:30 position
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