When faced with this I have slid the prop in place on the center spindle shaft. Place a couple small globs of RTV on the washer and slide into place. Make sure the hole position will allow the prop to be located at around 1:00 to 2:00 position at the beginning of the compression stroke. When the RTV is dry slide the prop off with the washer attached and drill on a drill press using the washer as a guide. It's best to use a new bit to reduce chances of the bit walking.