Weber IDF accelerator pump retrofit? Options

[r3dplanet]

I'm (still) messing with my Weber IDF carbs. They're tuned well except that one of the carbs pumps gas via the accelerator pump right away with the small flick of the throttle. The other carb doesn't pump until the throttle is turned a bit more. So it makes for goofy acceleration. Mine are early Italian carbs. I see that the modern ones have adjustable threads on the pump arms that I believe would allow to me syncronize. I spent quite a bit of time last summer rebuilding both carbs and while I was in there I replace each throttle shaft with new sealed bearings.

Here's my question: can the later style adjustable accelerator pump arms be retrofit onto the older style carb if the throttle shafts are also replaced with the newer style?

Thanks,
Marcus