Cobra PW3 2003 Owner's Service Manual page 27

Reeds
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The reeds must lay flat on the reed cage.
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If the reed tips aren't lying flat, replace them immediately.
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The reeds must have a tight seal on the reed cage.
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If the reed is damaged in any way, replace it. This means cracks, chips,
and ruptures. Anything abnormal, replace the reeds.
Take the reed cage out and hold it up to the light and look in through the cage. If
you see light between the reed pedals and the frame, then replace the reeds. If
you do not see light, then the reeds should be ok. (See figure 25)
The presence of light indicates that the reeds should be replaced, or possibly
turned over.
Figure 16
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