I'm thinking about buying a d1001, and I plan on tinkering with it ... recable and markl mods. In doing so I'll need to confirm the polarity of the solder pads on the drivers. One of the threads here suggests there's a red mark to identify the positive pad on the d1001, but in another d1001 recable thread the red mark on the magnet is nowhere near the pads, so that plan doesn't seem to hold water. With a multimeter its easy enough ... check continuity from the jack tip (left +) and ring (right +) to the solder pads on the drivers. But I do not own a multimeter, and the cost of such a tool for this single job isn't sensible. I might be able to borrow one, and yeah I know eventually something else will come up where I'll be happy to have one. But even a cheapie for $15 or $20 seems too much to spend for the one simple job I'd need it to do right now. SO, is there a SAFE (for the headphones) way to check for continuity without using a multimeter? I considered (for example) putting a flashlight bulb or an LED inline with a battery, hold it to the points to be tested, and see if it lights ... but I expect that might not be the best thing to do for the headphone driver. Just askin'.