An original option with the Bölkow 207 was to have a Sensenich fixed pitch propeller fitted. Not as cool as a constant speed prop and with a performance defecit, I figured it was only a bit less cool and the performance was only marginally poorer. I set about removing the propeller governor with it’s adapter and installing a blanking plate. The oil line is removed, the rear crankshaft plug pierced and a new front plug installed. The engine is now to Lycoming O-360 A2A specification which is a requirement for the fixed pitch prop.