This is my first post on CPF and I hope someone can help me. I recently got into flashlight mods and now it has me looking at 2 Surefire M300 and M600 clones I have. I would like to open them up to replace the driver and LED to something better. I have a KX and KE series head design. In the past I had an earlier version of clone with a KX head and they didn't glue/loctite the head and I could take it apart easily. I am about to attempt heating these with a heat gun but was looking for advice before I break something. Should I use the heat gun on low or high and for how long? I plan to use a strap wrench on the top section and a pair of vise grips with a section of cardboard(piece of inner tape roll) to protect the finish. Thanks guys