Seb,

I posted this thread for my E-sledge that shows the nippy rubber band prop saver:

http://www.rcuniverse.com/forum/m_14...tm.htm#1487876

These photos show what I did with the #64 rubber band:

http://www.rcuniverse.com/forum/upfi...78/Wu61484.jpg
http://www.rcuniverse.com/forum/upfi...78/Pn36686.jpg

Note, I did not drill out the APC prop for this. I used a small piece of brass tube to make up the spacer difference between the motor shaft and one of the stock APC slow flyer spacers. This way there is some room for the prop to move when it hits something. One of the above pics shows the prop snapped to the side so you can see the hub.