I have a fynspray ws67 that's incredibly hard to get at (the locknut).

I think, after trying one of those short-arm adjustable wrenches from bunnings and failing, that I need a crows-foot to do it.

Does anyone have one of these pumps sitting around that could tell me the nut size please? Even if I could find my vernier, I doubt I could reliably get it in to measure the nut.

Cheers....

Jon