The wheellock mechanism removed the problem of lighting & maintaining the match required by matchlock weapons.
The wheellock had a fairly complicated mechanism involving a chain &, main spring which rotated a serrated wheel. When the trigger was pulled the serrated wheel spun & came into contact with the cock (or dog) which held a piece of iron pyrite creating the required spark to ignite the priming powder in the pan & thus the main charge.
The downside was the complexity of the mechanism which made it expensive to produce & difficult to maintain. Whilst not so vulnerable to the effects of wind & rain small pieces of iron pyrites could break off & jam the mechanism & rust on the wheel or chain could seize it.
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