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The C4.5 I scored recently on Facebook ($100) was missing it's counter weight. apfever contacted me saying:
"The counter weight shaft is a standard metric M16X2.0 thread."
I've since procured an original counterweight from jkmccarthy who also contacted me (Thanks Jim!). The original counter weight shaft is definitely threaded along its entire length, and the (threaded) counter weight itself is rotated many turns to move it back and forth on the shaft.
One should be able to find a piece of M16X2.0 all thread for the shaft, dunno what one would do at that point for the counter weight itself though.
(is it counter weight or counterweight? dictionary likes both flavors)
Pretty sure that's the same thread as on the Synta EQ3-2 I have. If you aren't wedded to threaded counterweights (one of those examples of a Japanese engineering blunder), 20mm shafts and counterweights are easily found. Try McMaster for a stainless shaft. You need the lock knob too. I found a beauty with shiny, hard as nails solid plastic with a solid brass insert.
The Sears 6345 has threaded counterweights - 3 of them! - and they have received a lifetime limit of curses 
Only fealty to antiquity prevents me from replacing it. The weights are at least elegant, with little shoulders the size of a poker chip around the hole. The threaded shaft has a toe saver, which is the classic telescope equivalent of a NOOP in assembly language.
-drl
