I use a V-cutter and they have let that through. Unfortunately, I can't say that about a torch light. They took that.
Actually it was kind of funny. I bought one of those Zippo torch replacements. You take the guts out of the Zippo and replace it with a double touch. Works great. The TSA guy took it and said it was contraband. I was mildly upset, but said, well at least let me have the case. The guy wasn't going to give it to me. I yelled for the supervisor. I asked for him to give me back the lighter so that I could show him something. He handed it back, I ripped the touch replacement out of the case. Handed him the guts and put the gold case in my pocket. You could see the TSA inspector getting pi$$ed. All he had was the torch part of the lighter.
Actually, that is not the most prized possession I ever had taken by TSA. They took my P38 that I had from basic training. Unless you are over 50 or 55, you might not know what a P38 is. Us old guys in the military used to eat what was called C-rations. Today they have MRE's that come in pouches. C-rations were actual tin cans. The P38 was this tine little rectangle of metal with a little barb that flipped out, so you could open a can in the field. We are talking a barb that is probably a half an inch. TSA declared it a possible dangerous weapons. I did hate losing that. I had that bugger for over 40 years. It was simple, but it worked.