RCGF 120CC-Twin Operator's Manual page 10

Drill and Install the Propeller
The easiest way to drill the propeller to fit the hub is to use a drill guide. If you do not
have a drill guide, you can use the following method to drill your propeller. Most
propellers within the recommended size range have a 0.393" [10mm] center hole pre-
drilled. If your propeller has this predrilled hole, move on to step 3. If not, start with step 1.
1. Remove the cowling from the aircraft. Use the included propeller washer to mark the
centering hole on the propeller