W-30 / F-30 carb overhaul question

1) When reassembling the die-cast venturi into the housing, is there an orientation that must be followed (radially? )

2) Throttle butterfly plate..... ..How much daylight is too much around the hole ?

3) There's a little brass tube that apparently allows suction of gas from the bowl. Tube appeared to have been criped into the threaded nut portion and was loose. I assume this joint should be tight?

4) Tractor would not idle down where it should prior to the rebuild. Idle screw was fully backed out. Any areas of the carb that may be allowing the engine to run faster that I need to pay attention to ?

Thanx.....

Loosen the screws holding the throttle plate to the throttle shaft, and (with the idle speed screw backed off), wiggle the throttle plate around until it best tighly closes off the throttle bore. Then tighten the screws to hold the plate in that position. That likely will help your "idles too fast" problem.

Usually, the screws were originally staked to keep them from falling out and getting sucked into the motor. Loctite also works for this.