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Thanks puss. I wouldn't be able to leave a negative for him, but if I started a non-payer dispute against him (think that's the right title - I'm not very clued up on eBay) he might decide to 'get his own back' and leave me a negative. I don't know if eBay would allow him to do that - I would hope they wouldn't.
To be honest, I don't know much about problems with eBay, as I have mostly only bought stuff, and I have always paid on the day the auction finished.
As I mentioned before, I don't think it would be worth the hassle, taking into account the possible repercussions. Wish I'd never put the flippin' thing on eBay in the first place, to be honest. [:o)