Finally fitted a Plastimo adjustable transom bracket. Only 2 positions, it's either up or it's down! Had to grind off one of the bolt apertures from the stainless-steel mount in order to fit. The 7-man Pro has a angled transom and lip, which has caused me no end of problems. With 3 bolts fitted - this should be more than sufficient for the weight of the Tohatsu 3.5hp (18kg - long-shaft). Had to inverse one of the stainless-steel U bolts on the transom in order to fit.
I also took off the moulded nylon mount in order to cut it down slightly. With the transom bracket positioned far left of the main engine, there was still a slight clearance issue. Managed to cut approximately 1" off the right hand side. Now the main engine goes hard lock to lock with no contact with auxilliary.
One thing I have noticed now the auxilliary is fitted, is that there is a degree of movement. The bracket has some lateral and vertical movement. I suspect that's just adjustable brackets for you - as they will never be as rigid as a fixed mount.
To compound this - the Tohatsu [engine up] aluminium push-bolt seems poorly designed. My concern is that when underway in a moderate sea the push-bolt won't be sufficiently strong and could possibly shear with vibration?
Do any of you tether your auxilliaries for added rigidity? I didn't plan for this, but can't see any other way round it. Bleed'n typical!
Pictures to follow.