Fork bottom bushing from fork tube removal tool
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
Stephen Brenton's purpose made tool
Tool is shown attached to 1⁄2 inch breaker bar, fork and bushing are shown on right. MG# 12525900 T1
Marc Schneider's technique
Thank to Marc Schneider for sending me this information via email. In Marc's own words:
You and several others list a special tool to remove the lock nut holding the bottom fork bushing to the fork tube. Instead of going through the process of manufacturing a special tool you can just use a hook wrench with the appropriate size (pin max 5 mm × 5 mm or 5 mm diameter), diameter of the tool ~36 mm. I use an adjustable hook wrench (35 mm - 60 mm) with a 4 mm round pin and it worked perfectly. Just make sure you rest the tool on the nut and not the slightly larger shim between the nut and the bushing. Might not work if the nut is seized and rusted in place.