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I would check that they are in fact 4mm you may find that some "metric" bolts are not actually metric. I bought a packet of "6mm metric" bolts once from a hardware store to find that in fact they were Whitworth, 1/4" to be precise. The easiest way to make sure would be to take one with you and check that the pitch of the screws line up. If you place the two threads together they should mate perfectly, non metric ones will slowly "walk" past the threads on the bolt. Unfortunately the pitch on some imperial threads are very close to metric and you can actually screw the screw several turns into the thread before it jams. A vernier to check the diameter, if you have one would also be handy.
One of the first things I changed on my C11 was the silly little Philips head screws to a set of Bob's Knobs...with and SCT you don't even have to drop it to do some serious damage...just slip...
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