Found this:
"Weight Placement
(A) 12 o’clock (E) 6 o’clock
(B) 10 & 2 o’clock (F) Throat
(C) 3 & 9 o’clock (G) Handle
(D) 4 & 8 o’clock (H) Inside the handle
Position A: Adding weight in the vicinity of 12 o’clock produces the most dramatic increase in power, swingweight and head-heavy balance and produces the most dramatic decrease in maneuverability. Adding weight to this region moves the sweetspot towards the added weight.
Position B: Adding weight in this vicinity increases power, swingweight and head-heavy balance but not as drastically as with Position 1. Adding weight to this region increases stability on off-centered hits and reduces racquet torque or twisting.
Position C: Adding weight in the 3 / 9 o’clock location provides the greatest increase in stability. Power increases, as does swingweight and head-heaviness, but not as much as in location A or B, and so not as much maneuverability is lost.
Position D: Adding weight in this location provides an increases stability and weight without significantly affecting swingweight. Power and mass increase. This is the vicinity that weight is added in conjunction to another location to match racquet measurements.
Position E: Adding weight in the 6 o’clock region increases the mass without significantly altering the balance or swingweight.
Position F: Adding weight in the throat is usually designed to increase mass without altering the swingweight. This is another location that weight can be added to match the weight and balance of another racquet
Position G: Adding weight to the handle makes the racquet more head-light without losing maneuverability or significantly increasing power. Players wanting to counter-balance their racquets would most likely add weight in this location. Adding lead tape to the handle can increase the circumference of the grip, so caution should be exercised before adding too much weight.
Position H: Adding weight in the handle is another alternative for counter-balancing, that will not add additional width to the racquet handle. This procedure requires the removal of the butt cap and grip. Adding weight inside the handle cannot be performed with racquets that have some sort of vibration suppression technologies in the handle like (Prince’s Air Handle System, Pro Kennex’s Kinetic Technology or Dunlops’s ISIS System). There will be no noticeable change in swingweight or power."
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