below is a couple of photos of my Fleming setup on a long keeled canoe stern tiller steered sloop. took bit of work to get right - including adding additional struts to the fleming 3-point connection - now 5 points and rock solid. ladder on the side of the mount is handy for access.
I have a plastimo navik off my last 31' boat for spares or repair if someone wants to offer me a carton of coopers...
it worked beautifully, but i replaced it with this second hand flemming (from tassie) as they are a bit more robust. it has now sailed a few miles - all it needs is a replacement tillerpilot for motoring and I will be all set.