Hi varg:
Please have a look at this video. I think it will help.
The rotor head have the swashplate function (diferent than helicopter) but don´t have colective pitch. In the latest versions of Cierva gyrocopters they had a pitch control for improve the rendiment but isn´t necesary because the rotor runs like a wing.
I´ve wrote the video subtitles but I can´t finish because the Youtube editor doesn´t work in the last part of the video. Anybody could help me?