Thanks for getting back to me, Jon. I got both of those covered.

Because the accelerator pump both draws in fuel and exits it into the discharge chamber, I guess a ball of (? size) should go there to prevent a closed circuit.

One other issue is I don't have the accelerator pump return spring. The specs call for .6 mm gauge x 11 mm ID x 40 mm length.
I can source a similar spring from a neighbour but the length is only 35 mm. If I stretch it another 5 mm, will it make much of a difference in setup?