I just installed two M-61 Drop-Ins in two 6Ps that I have had for a while. They are the 325 Lumen Head. I am going to use these as weapon-mounted lights in an Elzetta Mount. The heads had a little play when mounted in the light, and I have read about wrapping them with aluminum foil to transfer the heat to the light body so it doesn't burn out the head. I did this with a small strip of foil, taping it so the head would go back into the light's body without the foil coming loose. Is this the correct procedure? The head doesn't move around any more, and I am guessing it will transfer the heat from the head to the light body correctly now.