You’re welcome lionheart_2281! 
I have no prior experience in flashlight modding either. I learned everything about flashlights here in BLF - thanx to our local experts who are more than willing to share their knowledge. 
Two threads by TomE became my guide in modding this BTU:
BTU Shocker Mod - XM-L2 U2's/SinkPAD's and I'm shocked by this Shocker... (de-domed now, more info)
Of course I asked a LOT of questions before I got it right (I think). :bigsmile: