Re: Custom intex motor mount supports!
The threaded rod is too thin imo. it will bend easily and may not do what you want it to. A larger diameter will work well.
Instead of the rod, I would try a thick walled pvc pipe, that goes over the motor mount rods and continues into the oar ear. With this one you will need a bit longer bolts to attach the motor mount to the original motor mounts on the boat and will need to drill holes in the pvc pipe for them. I would go with the same diameter bolts, just longer, so you don't compromise the strength of the pipe by drilling large holes. At the oar ears you may not need anything to hold the pipe to the ear - the tension there won't be that strong to pull the pipe out of the ear. If it does need support there, this is easy to solve with another hole in the base of the oar ear, on the opposite site of the hole you drilled to attached the threaded rod and then some strap or wire through the holes and over the ear will hold the pipe in place.