Well I've just had an update from the Trike Shop, and in a nut shell this is what happened. The diff the company sent wasn't the diff for my bike, it was for a Suzuki which is being triked. My diff was the first one ordered, four weeks later they ordered the Suzuki. The gearing in the Suzuki is in reverse to the F6B, so it was running the wrong way round hence the big hold in the casing. So now MY diff has been fitted and the conversation in now complete . I have some great pictures which I'll post on here tomorrow. So it's all done and is looking great. Cheers Guys.

Paul B.........