f you have a dremel, a clamp, and a ziploc bag, you can notch your motor shaft for a drive pulley in under 2 minutes. this is a brand new set of NTM propdrives i got from hobbyking before they all went backordered. NTMs don’t come with keys, notches, ring clip gooves, or anything. IF you do it this way and leave a small lip at the end of the shaft, you most likely won’t lose your pulleys while riding if for some reason your grub screw or bolt starts to back out and your belt breaks. Without the lip you certainly stand a very good chance of losing it in the grass or dirt should the belt break.