[Elecraft] Problem with a K3 screw - suggestions needed

[Fabio IZ4AFW / NZ1W]

Hi guys,
    today I decided to try to apply a mod (Audio Low Pass filter) to my 
beloved K3.
My K3 was born in September, 2009 and I bought it factory assembled.
Up till now, I just added a couple of additional filters and the KV3A 
board; so, I never unassembled the front panel before.

Today I found that one of the upper front panel screws was probably 
overtightened (or defective).
I tried to unscrew the screw with several phillips screwdrivers (little 
and big), to no avail.
The side effect of my (unsuccessful) tentatives was that:
1) I was not able to unscrew the screw
2) now the screw head is damaged (see pic at 
https://picasaweb.google.com/lh/photo/V1aTCoSq5qkgs3y-beE_DdMTjNZETYmyPJy0liipFm0?feat=directlink)

I got to unassemble the front panel unscrewing a couple of screws more, 
but I'd like to solve this little problem (moreover, it's ugly).
Before going with some more destructive methods (I am thinking about 
drilling the screw??), I'd like to have some savy suggestion from the 
community...
Moreover, do you know if Elecraft has an additional screw kit available 
(I don't need the stainless steel ones)?

As a side note, I found that almost all the flat-head screws were very 
"soft" and damage-prone (differently from the other round-head screws).

Thanks in advance for your suggestions,
73 Ciao
Fabio
  IZ4AFW - NZ1W - HI9/IZ4AFW