Comments: There is a rib or long staples in the butt cap area. I take the required amount of putty and mold it into a rectangular shape and wrap cotton wool around the putty. I then wedge it into the space against the staples and/or rib. So far, I have not had any issues with the putty leaking (the softer compositions tend to melt and spread) as it is held in by the cotton wool. This means I can also remove the putty easily. Only issue is that no amount of effort removes the cotton wool entirely from the putty.
From:Taylor G., 8/23/18

Comments: You must wrap it in something before putting it in the racquet. Otherwise the centripetal force from repeated swings and impacts will droop/smear the putty along the inside of the handle. Once that happens, the weight will be all over the place, completely throwing off the balance. I added this putty to my 3 Aero Pro Drives and even though they felt the same right after modification, they now all feel different. One APD swings significantly heavier and gave me wrist pain until I figured out this is the issue. What's worse is there is no way to clean up the mess inside the handle to reverse this, and I now have 3 racquets with swingweights all over the place.
From:Derek, 1/15/18
Note from TW: Hi Derek, We recommend always using a cotton ball to either sink the putty in or sandwich the putty between so there are no issues with the tungsten traveling through the handle or into the racquet. TW Staff

Comments: Game-changer! I stuffed two boxes of this into the handle of a Gamma Bubba 137. It turned it from a head-heavy grandpa stick into the most potent head-light player's stick I've ever used, bar none!
From:Srikanth, 1/17