I once repaired a G5 W for a neighbor who needed the club daily so sending it to PING was not an option. The swingweight badge came out and was lost. I had his 9i at D1 so I used epoxy and small washers to fill the cavity to bring his W to D2, where he wanted it. It looks like shit, but i see the club every week and it's still together after 3 years and LOTS of rounds.
I tried filling it with lead tape and it would not stay.
A swingweight scale will make the job a bit more accurate.
Lastly, I have sent heads-only to PING for refurbishment and they did it, same charge.