Ok , I've just noticed something underneath , the red gear shift is really loose and is just clearing the prop so I'll investigate further , I assuming it's not meant to be loose , it's still attached by a bolt but it wobbles all over the place, and I mean all over the place , I'll attach a video when Ava , thanks although it doesn't seem to be catching I wondered if this gave any clues ? I'm not ignoring your suggestions but daylight hours and work are restricting me at moment , thanks