After adjusting my chain yesterday, I like my GRAINGER $6.95 30mm offset boxend wrench even better. It will fit over the axle nut, onto the stub axle. This allows some tension to be kept on the axle nut,so the snail adjusters dont move unless you want them to, & makes the the ticklish wheel alignment/chain adjustment much easier.
I also found that my Brake plate anchor nut is NOT METRIC or SAE -- it is WHITWORTH. Did Enfield use old stock assembling these 2010 G5 Deluxe bikes
It appears to be the original from the factory. Wierd