Replacing my window cranks...

My window cranks are 25 years old. The most used ones are starting to fail. Unfortunately I don't see anyway to get them out without taking the whole window apart. They must have designed it better than that, so I think I am just missing the trick. Anyone know?
http://www.frontiernet.net/~toller/crank.jpg
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I've got the exact same windows in the loft above my garage, just order the whole actuator from Andersen. you will need to R&R at least the wood trim above the actuator, and more if required to do so. Fortunately they are inexpensive, about $20-30 apiece IIRC. I'd lube up the tracks well with a non-greasy lube (silicone or teflon) to keep this from happening in the future; there's a lot of leverage on the mechanism when the windows are opened more than 2/3 of the way.
nate
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The cogs on the shaft look fine. Have you oiled the mechanism? 25 years is a long time without oil. :)
You may also need new crank handles if the handle cogs are worn. You can test this by borrowing handles from windows that rarely get opened.
Crank handles are not hard to get.
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