I agree with FB- the earlier splined Shimano freewheels used a smaller-diameter tool than the ubiquitous FR-1.
Another source is Bike Tools Etc.:
http://www.biketoolsetc.com/index.cg...s-Splined&q=&s
, listed as "
SMALL DIAMETER SHIMANO FW REMOVER (Item #UB-FW20)"
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Jeff Wills
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