Jan has brought this to us :
I have a slot (cut in the case of a fully assembled computer) about 90mm x
10mm. I need to extend the slot to about 94mm x 10mm.

You need a tool called a 'Nibbler'. These take clean bytes out of thin
metal of about 2mm x 5mm each time you squeese the handles. Tandy used
to do them and I suspect Maplin electronics will stock them. They look
roughly similar to a pair of pliers, have a sort of anvil and moving
post with a hooked end which takes bytes.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org