It easy All you have to do is add the prop between washer and the corn and then insert it into your motor shaft and you will get a little screw(You can see it in the picture on black colour)Just insert it to the place as you see in the picture and make it tight.Then it want falling.But You can remove the prop adapter easily by your hand without removing that little screw.If you do this thing right it wont fall.If this help Please credited me.Thank you
Dimensions please Jason !!!!!!! Wy you never write it???? This hapenns with a lot off your products, wrong pictures... wrong weigth... wrong data... Is it realy so dificult to do???? /Waht is the legth shaft? The width is 5mm. I know because Bat-22 write it not you. I realy believe that you have to see all your products descriptions and complet the info that can be necessary to yours costumer. Don't you think so?