Quick one - which size of Castle Nut for a Honda BF50D?

[Chunk]

I'm replacing my 3 blade prop for a 4 blade and my largest socket is 21mm. This is too small. I'll buy a larger one on my way home but wondered if anyone knows the correct size - I'd estimate 24mm.

Thanks in advance
Chunk

[Black]

I bought a 22 to do this job on my Honda 50, too small and ended up using a good quality adjustable spanner.

Good luck

[Chunk]

Thanks, I've bought a 22mm and a 24mm so will throw away the 22 and try the 24

[Chunk]

Quick update incase anyone else is looking in the future:

2013 Honda BF50 Castle Nut size requires a 22mm socket

Cheers
Chunk