I own a Smith PA12 experimental with seaplane doors on L and R side. What I would like to do is 'add' a throttle position for the rear seat which would only be there temporarily. Reason for installation is that I want to get my commercial ticket and our two local DPE's are requiring FULL controls for the DPE. Throttle, stick, rudder. It just makes sense for me, since I own this plane, to get my commercial ticket in the plane which would then allow me commercial privileges in both ASEL and ASES. Does anyone have pictures of such a setup? Diagrams? Information to assist me before tackling the project? I am hoping to keep the installation as simple and non-intrusive as possible and when finished with training, to remove it. I would appreciate any and all help you could give me. My email is: etjones763@yahoo.com If you have pictures you could send, or diagram, or any other assistance, either email me or post here??? THanks again!!!