Hello!
I gotta the same problem to my standard charge al...
I think the only way is to drill a 1,2mm hole in the handle.
For the charge is more easier cause i can hold off the external alluminium (or titanium) handle, but for the wave, you can drill (diam 1,2mm) both sides of the handle and press a 1,6mm ball, using a little hammer and an old 1,2mm driller point (i dont know if the word "driller point" is correct, ive got a bad english).
Here in italy is easy to find the 1,6mm balls!
Bye!