I personally could care less what anyone does. What work's for one might not work for other's. Spring no spring? Take the spring off, run the engine for 2 hours twice a week and before six months are up you will have problem's. If it is not ran that much odd's are you never will have a problem. But one thing is a fact, every single part of these carbs are there for a reason. If that reason is not needed by someone  then do as you wish. There is only one piece that is not needed on the engine for our application and that would be the idle set screw.