Well I put on two 5/16th flat washers that seem to fit pretty good on the crank shaft along with the prop nut and it seems to be very snug. I know that it can all come loose very quickly thought once things start spinning so for piece of mind I might go buy a couple of 5/16th prop washers instead. If anyone has used just regular flat washers, let me know how it worked out or did you have to swith to prop washers?

Thanks for the input