Got myself a pair of nice but worn HD25, with loose spring on the adjustable sliders. Extremely irritating with the cups sliding down to their lowest point at every minute movement of the head, and as I didn't find the idea of electric tape on the sliders appealing, decided to try another solution.
Here goes, made at your own risk, of course.
Original, severly hanging.
I was surprised that this warhorse, a professional tool, got worn this way. It's designed to do duty in studios, in the field, at hockey games, at rugby matches, in Alaska, in South Africa...
My pair looked like it had been subjected to heavy use for many years, but the driver was dated April 2007 (or October 2007?) so it's relatively new.
Problem is the plastic spring has lost it's elasticity, or the sliders have worn down (less likely), or both. Here's the contact area.
So it needs to be tighthened, and the tools are an ordinary clamp, a screw and a hair dryer.
First, fix the screw to the clamp with some double sided tape, makes the whole affair a lot easier.
Then fix the clamp to the cup, just to keep it in place, no pressure.
Turn the hair dryer on, and aim at the the spring for 3-4 minutes.
Carefully tighten the clamp to push the spring down a few fractures of a millimeter, then apply some hot air again for 2-3 minutes.
Let it cool properly with the clamp still in place. I left it overnight, but an hour or so should be enough.
Put the sliders in the cups end enjoy those sharp clicks when you adjust the headphone.
Material fatigue and plastic memory may affect long run function, but for me it still works fine.
Edited by MDR30 - 11/30/14 at 3:56am