MKII part numbers ?

help,
i cross treaded the action screws in my MKII and when trying to undo them i ended up un-screwing the stock assembly stud of the action and now i cannot remove it from the stock.

basically now i have a cross threaded action screw stuck into the stud.

does anyone know the part numbers and where to get replacement bits ?
i'm trying hard to get it unscrewed but am generally doing more damage (i think) in getting it all free.

so any part numbers or websites that have these items in stock would be helpful.
cheers

here's a pic

or help in getting the action screw free of the stock assembly stud.
[img width=600 height=450]http://i57.photobucket.com/albums/g231/Medic_01/IMGP2693.jpg[/img]

Oop's what have you done? :o If you get stuck try http://www.thegunsmiths.com.au/
The do great work.

thanks Jasta,

BTW can anyone tell me the thread size for the stock assembly stud ?
(the bolt in the picture above)