I got a prop adapter, and fitted the prop. However, I think I've got the wrong prop. With the motor rotating CCW, it's a pusher prop. I bought one that said the rotation direction was to the left, so I thought that would be the right one.
I got the prop adapter from my local shop, and picked up another prop as a spare. But it's 9x6. Just running them in the house, I can feel how much more powerful the 9x6 is compare with the 9x5. I could use it, but it might make the maiden flight a bit...eh.... exciting