Work in Progress - Comments Welcome

## Using the Gradient Line Balance Hole

Before we can determine what Gradient Line Balance Hole we can place, there are a few extenuating details we must first consider. The most important of those being the static weights of the ball we are drilling. For example, if we have intentions of placing a low weight hole, typically P3 and P4 locations, we need to ensure we have some thumb weight (less than 1oz) and a little positive side weight (less than 1oz) because drilling low weight holes will remove weight from the positive thumb quadrant of the ball. By ensuring the ball has less than 1oz of thumb and positive side weight, the ball remains legal if we decide we don't want the weight hole after all.

To ensure we get this kind of configuration with the minimum of effort, it's best to use longer pin out balls (3" or more pin to CG), as these give us a greater chance of getting the CG marker at least near the center of grip. If you can get the CG on the midline and slightly to the right of the centerline, we have access to the widest range of Gradient Line placements, with a minimum of fuss. Placing the CG in this position, gives you a minimum of finger/thumb weight (depending on the depths of the finger and thumb holes. See below.) and a little positive side weight. While this configuration gives us access to all weight hole positions, the allowable weight holes will be on the small side, unless we manipulate the static weights a little more. The further below the mid line the CG gets, the bigger you can make low weight holes.

In the case of a Double Thumb weight hole, to get the most out of the weight hole, you probably want at least 2oz of thumb weight, since a 1.25" diameter hole, drilled 3" deep removes over 3oz of weight from the ball.

## Manipulating Static Weights

Some times, even after we place a weight hole, we might want to make the weight hole deeper, or bigger. If the static weights don't allow that, there are a few things we can do.

If we need to increase thumb weight, the easiest way to do this is to drill the finger holes deeper, up to 4.25" deep. Most of the time, finger holes are drilled at a depth between 1.75" to 2", removing around 1oz a piece.

If we need a more positive side weight, one way to get it is to drill the middle finger hole much deeper than the ring finger hole, up to 4.25" deep.

## The Gradient Line and Symmetrical balls

There seems to be a little confusion surrounding the use of Gradient Line placements in Symmetrical balls. The most confusion seems to be surrounding the placement of P3 and P4 holes.

File:File:Symmetricballpholes.JPG