Thanks all for your help.
You're right Gadge I can see now how the pulley direction would tighten the nut on a RH thread, I guess some of us tend to over complicate things. But I don't have access to a decent impact wrench so will have to persevere with a socket and bar or a good old ring spanner.

Yep AVB I think I might have some impact rated sockets but I'm not sure I'll have one the correct size. The Toro is American I think so has imperial sizing but so much of my stuff these days are metric, why do we have to use two different ways of measuring the same thing????? WTF

Last edited by Bob W; 21/11/15 02:03 AM.