I’m trying to find someone who will sell me a used 1/2″ threaded collet for an old Porter Cable 3HP router.  It fits old Rockwell routers also.  The design is different from the current P-C collets.  This is a one-piece collet that is threaded on the outside and it has a cone shaped top.  Porter Cable has them, but they are about $30 + $7 shipping which is prohibitively expensive for me.  If you have one in your junk box and are willing to part with it, please email me at [email protected].  I can get you the part number or a picture of the 1/4″ collet if you need it.  Thanks….KB