Originally Posted by
JohnDThompson
Shimano FFS is likely correct. I think the Shimano TL-FW20 (#2 in the chart you cite) may be the proper tool. It's been out of production for several decades, though.
If the proper tool is the Shimano TL-FW20, then the repro Kengine FR-04 may work
THis tool claims to "compare" to the TL-FW20 and to work on FFS. I bought one a while back for a very old (late 70s) Shimano freewheel that the typical Park tool would not fit.