The screws used in various drives are deceptive. They are not all a
uniform size so be very careful. I'd check eBay to be honest as they
often have 'kits' with a few hundred various sized screws in them.
Far, far cheaper than Maplin too.
--
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Don't take it to the tip recycle it via the Freecycle(r) Network.
For a group near to you look here:
Worldwide
http://www.freecycle.org/
United Kingdom
http://uk.freecycle.org/
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Kevan Farmer
Linux user #373362
Staffordshire