Can use the 6-113 drag washer (HT100) to sub for the 4-60 hard fiber washer (delrin), as noted in some of the AlanTani.com customizations.
COMPATIBILITY ISSUE
THIS COULD APPLY ALL REELS USING 98-FTH20LW MAIN GEAR SHAFT
Definitely applies to the 4-60 washer listed on SQL15LW, SQL20LW, SQL20LWLC, SQL20LWLH schematics is TOO LARGE on the ID and slops around on the shaft, so we contacted Penn (see below) about the part number (listed on Rev0-Rev2 Penn schematics. 4-FTH20LW aka 4-20 was also not correct fit during testing to find one that works properly.
WORKAROUND SUBSTITUTE FOUND by MysticParts
Use instead 4-WAR15LW same OD as 4-60
ID is perfect on the 98-FTH20LW Shaft
NOTE: This is a working sub but it is slightly tighter than the unknown washer that was there as this HT100 washer is a little thicker. 5/22/24 ~Staff at MysticParts.
PER PENN: The looseness of the 4-60 in the Fathom reels does not matter once everthing else is installed in place.