... its up to you to maintain certain standards here and make sure that those standards are adhered to by other users. Calling someone a wanker is I feel, rather below standard ...
I say "Screw That".
I'm not involved in any transaction with Deore, but when a member of a forum community, especially one as niche oriented as Retrobike, fails to honor a simple Buy-Sell transaction, they should be tarred and feathered. Being termed a wanker is totally called for. I'd add some other words but they'd be ****.
I have Item for sale. You want Item for sale. You send me money. I send you Item (promptly). Duh.
Anyone who deviates from that is a wanking moron and kills the Trust we forum members have in all future transactions. Honesty, transperancy and fairness are needed for these online communuties to grow and propser, not bounced checks and missing parcels.