Either way, you will know exactly how and where the pieces originally fit. You need to know reed length and block length, or how much of the reed was exposed. Once you have marks where the wedge goes and how far the reed goes, you can play with it until you find the sound you like. It does not take a lot to change the sound. Haydel says reed replacement is likely for those who hunt long and hard.
Reeds can crack and break, and sometimes they just get out of whack.
Having an extra set of reeds with you and knowing how to change them can save the day if something should happen to the reeds in your call. Most call makers make replacement reeds available to their customers. These reeds come in varying degrees of thickness and are cut, or trimmed, in slightly different manners. Reed thickness is matched to fit the call. You can manipulate the reeds in a double-reed call to find a sound you like, but do so with caution.