[JudgmentZefhyr]

As the title states, while I was trying to mod my Sennheiser HD 555, I accidently dropped the screws into the magnet. I managed to get them out but I'm wondering if this would damage the headphones?
 
Other than the fact I had screws scraping against the magnet, they also pushed the thin veil above the magnet downwards. Does this thin see-through veil do anything that affects the sound quality or is it just there to block the magnet?

 

[TopspinTEC]

I'm guessing the thin veil you're talking about is the diaphragm.  It's just there to push air and make sound. . . I think.  If it's not torn then it's probably not going to effect the sound.  Every diaphragm I've seen has been so incredibly fragile that I'm surprised yours didn't tear.

 

[pp312]

Maybe he's talking about the famous Sennheiser veil. Someone's finally found it! 

 
To the OP, if you can't see any physical problem like a tear in the diaphragm, and don't hear anything wrong, then it's unlikely you've done any real damage. But keep those screws away from the magnets in future! 

 

[JudgmentZefhyr]

Ah, thank you for the information. It looked fragile at first but it appears to be quite strong from what I can tell. Would the fact that I had the headphones plugged in and on while this all happened affect anything?

 

[pp312]

In a word, no.