RE: Welcome to Club SAITO !
I used a quick connect on which the pin was larger than the hole in the arm and it split the end of the arm.
As for priming, holding your finger over the muffler outlet while flipping the prop will take fuel to the regulator but it will not flow into the engine until the spraybar demands fuel. Flipping at just above idle may be enough fuel draw to allow fuel to flow into the engine. That is something I'll have to play with.