Some (most???) of the post-Potter 23s did not have the center stringer at all. Several 23 owners have removed it during rebuild or replaced it with a different configuration like a half round of 3-6" PVC pipe. The big thing is to make sure you do a good job on the hull patch. Take a look at what BigShrimpin did when he had to patch a hole in his hull while fixing his stringer - he did a thread earlier this year on it.
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