Take the spacebar off and make sure it's seated right. If it's not seated on the spring right, that can cause issues. When the key is off, doublecheck that the spring looks to be normal height compared with the other springs. If it's not, you might have to swap or replace it (I recommend scroll-lock, since I don't use it).
I haven't done it, but you can supposedly switch the springs using a chopstick. Lookup sandy55's chopstick of death method.
More importantly, make sure the stabilizer bar is on right. I've had that cause issues for me. Any pictures you can post?
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You should be able to get spare springs and hammers from unicomp. Email them or open a support ticket, and they sholud be able to help you. If they don't do international shipping, there are GH'ers that can mail forward.