I have a new wave and I'd say this is definitely not normal. You should be able to get this repaired by LM and they can check over the whole unit for other irregularities (replacing parts if need be).
If you choose to adjust it yourself, invest in a set of tamper-proof bit heads. You can get a plastic case of 20 in the most common sizes and formats for about $10 if you look around. They are useful for taking apart some electronics equipment. It's also fun having those with you when you are bored in a bathroom stall... Wait, did I just say that outloud? <img src="/images/graemlins/wink.gif" alt="" />
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Experience is a hard teacher because she gives the test first, the lesson afterwards.