Originally Posted by
ParaWK4
Cogs from new Shimano freewheel where it is held together by a lockring (MF-HG37) - onto an old Shimano 600 freewheel body where the last cog threads on to hold it together. No cassette involved.
OK, assuming that the cogs of the MF-HG37 have an identical spline pattern as the MF-HG40:
http://techdocs.shimano.com/media/te...9830609020.pdf
I'd say your plan will work. The splines look identical to the old 600/Dura-Ace freewheels I worked on (20 years ago).
FWIW: Loose Screws still sells individual Shimano freewheel cogs:
http://www.loosescrews.com/index.cgi...ogs&tc=Shimano
Judging by the prices, though, it's probably cheaper to buy a whole new Shimano freewheel.