There's a bit in the manual about wiring a foil such that the barrel is free to be tightened without worrying about pinching the wire, and you can change the whole barrel without rewiring it. To summarize, you remove the plastic cup, cut off the little brass cap from the end of the wire, and glue in the wire, leaving a little bit of extra length off the tip end of the blade. Remove the insulation from the end of the wire (leaving a bit where the wire will come through the cup). Place the cup in the barrel, and put the barrel on the blade, threading the wire end through the little hole in the plastic cup. Tighten the barrel, and then squish the wire end down within the plastic cup, so that it essentially takes the place (electrically speaking) of the brass cap. Then you can install the tip as normal. Has anyone tried this method? I thought this was interesting and I'm trying it on one of my foils, but it's a fiddly process and I haven't been 100% successful. Currently, the foil doesn't go off every time the tip is depressed, so there's a short, which I've isolated to the tip. I think it's probably that the spring is occasionally contacting the barrel, since there is no brass cap to help align it. Any ideas for aligning it? Also, smushing the wire down into the cup was a major pain in the ass. I ended up fiddling around with a pair of tweezers and eventually got it, but there must be an easier way. I'm wondering if I should cut the wire a bit shorter, and file down the bottom end of the brass cap, and stick the cap in on top of the wire, so the spring can be held in place better. Would love to hear people's experience with this method, and any tips or tricks you might have.