Campy NR / SR forever
Join Date: Jun 2007
Bikes: 1977-78 Raleigh Professional - bought new, 1987 Shogun 400 (for the lady)
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If you have the 5 speed freewheel, you should be able to unscrew alll the cogs and put the three loarest ones on the 4 speed.
If your assumption is correct (and it may very well be), then the 4, 5, and 6 speed freewheels ALL used the same body, and it was the differences in the smaller 1, 2, or 3 cogs that made it a 4, 5, or 6 speed freewheel!
Bear in mind that those cogs tend to take on the strength or hercules after many years of riding and are very difficult to remove. And, the two largest cogs screw off to the INSIDE - towards the spokes.