I think a very small amount of most any light lube that would not attack the plastic would be OK.A dielectric grease would not affect the connection.
I had mine a week and am very impressed. Against my Q701s that cost me about 5X the price, there is little competition. But just looking at the price point, they are certainly the king when it comes to Value! The sound is lacking some clarity, you can use an equalizer to trim it your preference, or not. I took some of the very light foam material like they pack in the cardboard jewelry boxes (similar to polyfill), and put about 1/2" thickness and trimmed it to fit the cavity of each earpiece. I think it seemed to even out the response a bit, that's totally subjective, but it certainly did not hurt the sound quality.. I've ordered the DT250 velour pads. Holding off on the headband fix for now, does not really bother me much.
Also ordered a Monoprice 6' audio cable to replace the shorter skinny one. For a total investment of about $27 for mods. I think it is worth it since I am starting out with nice sounding cans to begin with.
