Otherwise the switch has to come out of the top. Normally this will drop out of the battery end, when they aren't corroded-in. Here I came up against the spring steel circlip holding-in and locating the switch. One of my 4 x "D" cell Maglite's had gone the same way. I tried soaking in boiling water, drilling, hammering and eventually gave up. My 4 x "A" cell Maglite batteries leaked, and corroded in the torch barrel. I may have a spare in my flashlight parts box. If you do destroy the switch getting it out, let me know. You can catch the ground screw or nut on the threads and damage the threads and the switch. Try not to force the switch out past the tail threads by force. Once you get the batteries unstuck, use care as you drive them out the tail. The switch body itself is pretty sturdy so you'll be able to use it to put a decent amount of force on the batteries. There are some plastic vertical stiffeners that will probably break in the process, but don't worry about them because the switch works fine without them. You put the PVC around the bulb post and use it to hammer on the top of the switch. The outside diameter needs to fit past the inside of the retaining ring. The inside diameter needs to fit around the center bulb post and the little brass screw on the side of it. The PVC size needs to be just right, I think I used 3/4" last time I did it. You'll need to use a piece of PVC tubing to drive the batteries and the switch out the tail end of the body. And you've got a some chance of destroying the switch in the process, depending how stuck the batteries are. If you can't get the switch out, it's more difficult but not impossible. Once you pull out the retaining ring, the swich can be pulled out the bulb end of the body. But if you can get some room between the top of the switch and the retaing ring, just pry out the end of the ring and lift up on it to get the ring out of the groove in the body. If you can't push the switch towards the tail end just a bit, it's nearly impossible to get the retaining ring out since it sets in a groove in the body and there's a recess in the top or the switch that will prevent you from getting the ring out. Most MagD lights have switches held in with a retaining ring at the bulb end. Now you have a tube open at both ends and you can pound away until the corroded batteries come out. But almost any 2 straight sticks with small enough tips held in an X pattern will work. I've found some small needle nose pliers work well to stick in the holes and give a good handle to unscrew it.
Look at the bulb end, if there is a fairly wide brass ring with a pair if holes on either side you just unscrew it. If you have a really old maglight, where the switch is held in with a screw in ring, you're lucky. The newest mags use a star wrench, I think it's T7 size but I'm not sure. For all but the newest Mags you need a 5/64" (or 2mm) allen wrench. Then you need to loosen the grounding set screw that's at the bottom of the hole in the middle of the switch. Regardless of what type of Maglight you have, start by popping off the rubber cover on the switch. The best way is to remove the switch assembly and then use a wooden dowel to drive the batteries out either end. There's a couple ways you can try to get the batteries out.
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