With the re-launch of Bowling This Month, April 2014, I wrote about the new and improved Tiered Oval Process Version 3 thumb. TOPS3 will improve your swing and release. TOPS3 is a significantly comfortable thumb shape option as well. The process is designed to create a more anatomically correct shaped thumb designed to avoid bending the thumb.
With the VAR-E Axis of Rotation System, learn how-to alter ball motion more easily. I have found it easier to teach axis of rotation variation by focusing on the center of the palm as compared with teaching it referencing the fingers and thumb. With VAR-E, the key to altering ball motion easily is to envision a clock face relative to the center of your palm.