Dont worry lol , i screwed one side of my echo external bb in my gu the wrong way round (wondered why it was stiff) Took it to halfords they retapped it , my bb just spun in , job done , sorted , no problems. Take it to halfords/ local bike shop. Edit: Dont try turn it more or owt just take it out and leave it , theyle have the tools to sort it properly itle be fine. fuk just realised uve sorted it, ignore this then.