Pa50 reed block is the same as nu50 reed block . You need to open the case a lil bit to fit them . In the pic attached , top left is my mod reeds . Right nu50 reeds . Bottom nc50 reeds . The nu50 and pa50 reeds stick out into the case . The nc50 reeds are flat . NC 50 reeds flow is tiny in compairison to the others . All you have to do is stuff some wax or clay or whatever you want to use over the crank . Then dremel out that material that keeps the reed block from fitting down in there . Its not that much , and its easy to do .
