...he cut me a heavy duty 220 extension cord with double male connectors...
Double male connectors are great BUT be extremely careful in using them. I always unload and disconnect all lines from my generators, and let them idle down, unloaded, for a few minutes before shutting them down completely. It is all too common for us to pull a power cord from a wall outlet and not think about power still being applied and available, as usually that is the case when you remove the cord/plug from the socket. However, depending on how you disconnect a double male cord, one end may still have power and be hot. Just a word of caution to only make or break double male connections with all power removed. Just remember that power may still be on to the exposed male connectors/terminals whereas you normally don't have to worry about grabbing a female connector end with its hidden terminals.