This 4-speed transmission arbor tool is what you need to replace the clutch hub nut to allow test rotation with 1/2 drill.
Fits:
FL 1941-1984
Fx 1971-1984
UOM: EA
Country Of Origin: TAIWAN
Accessory Items:
16-0116 – Mainshaft Ball Bearing Lock Nut Wrench Tool
16-1803 – Mainshaft Seal Remover and Installer
16-0114 – 4th Gear Nut Tool
16-0821 – Counter Sprocket Nut Tool