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?????
