greg bender
http://www.thisoldtractor.com/gtbender
This tool is applicable to 5 speed transmissions only. 4 speed transmissions utilize a snap ring on either side of the clutch hub. Use with 1/2" breaker bar. See Guzzi Manual, Fig 79/2, tool 28. MG# 14912600
Stephen Brenton is kind enough to manufacture this tool. Contact him directly for price and availability.