I'm with JimC. It seems like replacing followers solve a lot of problems. I routinely replace them--usually once a year--and certainly every time I bought a used magazine (at least when I could still get rebuild kits from Glockmeister). I'm kind of fanatic about maintaining tools on which my life may depend. Speaking about being fanatic about properly maintaining tools on which my life depends, I'm another one who doubts the wisdom of having to set down at "my kitchen table with file,dremel and punch in hand" to try to make something work that was not intended to work.
The bottom line is Glock, Inc. has left owners of pre-ban hi-caps "high and dry." While it is true that only 9x19 magazines are affected now now, the word is (on Glock Talk at least) that the .40 S&W (and probably 357 Sig) magazines are next since the purpose of the change seems to be cost cutting the manufacture of the magazine rather than any improvement in functioning (even though the end result will be eventually to render pre-ban magazines useless).
The bottom line is Glock, Inc. has left owners of pre-ban hi-caps "high and dry." While it is true that only 9x19 magazines are affected now now, the word is (on Glock Talk at least) that the .40 S&W (and probably 357 Sig) magazines are next since the purpose of the change seems to be cost cutting the manufacture of the magazine rather than any improvement in functioning (even though the end result will be eventually to render pre-ban magazines useless).