RUBBER WASHER
3 mm rubber flange
to be mounted between the hub and the wooden propeller
Helps to track the propeller blades and reduces the vibrations/noise of propeller rotation
The correct sequence is reducer, rubber flange, propeller, metal flange
advise :
Don't use the rubber flange together with the 30 mm M7A/1A or 60 mm M7A/2A spacers
M7A/1
3 mm rubber flange
to be mounted between the hub and the wooden propeller