Thanks Neil,
I bought a new spinner and rotor mount yesterday and fitted them this afternoon along with some blue loctite (the guy in the shop said that red would be pushing it!).
Fired up the quad and had it hover, pushed the sticks forward to make it fly and promptly crashed it!
I see this as progress - it's the first time I've managed to crash the quad because of bad piloting rather than bad engineering!
Hoping to have another go at the weekend, but it's looking unlikely as xc weather shows it gusting up to 18MPH in my area - ah well, perhaps next week...
Now, where did I put that manual on what's backwards/forwards/left/right on a KK 2.1.5?