Looks like it should work as designed . . . .
but, if you let go of the handle, it will fall down and flip flop on the deck - - - -
That universal joint does not hold it in the operating position, it just allows you to
use your tiller while your body is in different positions.
Try to imagine that same universal joint from your 3/8" or 1/2" drive ratchet.
It WILL work, but, I think you will become exasperated with it rather quickly
then start looking for a piece of PVC pipe.
I am not an outboard "tillerman" AT ALL - but, in my honest opinion, I would not
recommend that gadget for an outboard - ever - trolling motor only.
Too much bad stuff could happen rather quickly with one wrong twitch and turn of that extension.
I myself, as well as others, just simply slip on a piece of PVC thin wall pipe
and it works quite well. Couple of long stainless screws holds it all together.
I say "long" screws because you have to go into the metal arm of the tiller
or else the rubber grip may come off when you pull too hard on the PVC pipe.
It is quite comfortable to operate from the front pedestal seat with the tiller
adjusted to the right height for the operator.
for some reason, I could not post photos this morning - I guess the bug is gone now.