You could try some of your local little engineering supply shops. I went through eBay to find some big sockets (for my FJ gearbox sprocket for one) and they were all about the same price as you quoted, plus delivery and a couple of days wait.I looked up local engineering/supply companies and found a couple straight away that had the bigger sockets in stock at the same price (or slightly cheaper) so I managed to get the jobs done without any delay.Also, for a little bit more money, Halfords stock bigger sockets too - I suppose I'm just impatient so I don't like waiting for things to be delivered
If you still have the toolkit there’s usually a spanner to fit the back nut. Will do if you mark where it is the start then count turns off.
The front sprocket nuts are always a bastard to undo, they are screwed on with Loctite 620, the hardest setting loctite. Bike in gear, chain guard off, piece of 3 X 2" timber through the spokes of rear wheel and across the top of the swinging arm to lock the rear wheel completely, socket and the longest torsion bar you have and swing on it, get a friend to support the bike to stop you pulling it over. In the end I had to take a hammer and blunt chisel to mine and drift it around but even then it did not give up easily. Good luck
Put it all back together today,got to admit I put the original nut and washer back on,I never gave it a thought 'till I seen the post,hopefully it'll be ok,I've never put a new nut on any other bike,but obviously it's the thing to do.While I think about it does anyone have a problem putting the rear wheel back on their own?(gen 2) I always have a right game with that poxy caliper bracket,by now you're probably thinking "can this joker do anything?" I really don't normally have probs with working on my bikes,in actual fact I enjoy it,I only do basic servicing and cosmetic jobs,I wouldn't start stripping engines and box's etc.It's just that this particular job has been a ball ache what with not putting the cush drive rubbers in far enough and then couldn't shift the sprocket nut,can't win 'em all ay?still thanks for your replies it's always reassuring to know there's someone who'll help you out.