Hi Andy
Don't know this additional info helps, but when berthed normally the cleat on the end of the pontoon finger is roughly in line with the second stanchion back from the bow. When I drop the mast I move the boat forward in the berth and secure it with the midships cleat tied off close to the pontoon cleat. When the mast comes down the mast tip is just about level with the far side of the main pontoon, and I can just about work on it without having to move the mast forwards. However, don't forget you've got the radio aerial sticking out another couple of feet beyond the top of the mast, and mine just clears the windscreen of the motor boat parked in the berth the other side of the pontoon. If there's more than a little work to do on the mast then I move it forward to the trailing position on the bowsprit, which apart from making it easier to access the end, stops the passing boat owners tutting about having to duck under the long black thing blocking the pontoon!
Nick