Eyepiece Parfocalizing

Where can parafocal rings be found? My discombobulated collection seems to constantly whisper for me to hunt down some rings.

How many people bother to parafocalize their eyepieces?

rgds mike g

http://www3.bc.sympatico.ca/gwolanski/PARFRING.HTM

I've never used these, though. Instead I use 1.25" rubber slip-joint washers from the plumbing section of a hardware store and/or o-rings, whatever it takes to get close. For 2" eyepieces I stretch the 1.5" rubber slip-joint washers. Another trick for 2" eyepieces is to cut hunks of 2" ABS or PVC pipe. You can hold it on with a slip-joint washer.
--
Mike