Toby,
Yes the shaft has to be turned down to fit a Parker. I do it with a Dremel tool, and then a dab of Super glue. I try to get it close so it somewhat screws in, but I have lost them when using the guns due to glue letting go, making the shaft too small, or hitting them. I know it is a common thread size but I will let someone else give you that dimension. That would make them a simple screw in installation. Thanks.
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