Personally, I have never had to use that method on any of the 8 rear carb gassers that I have, all of which are in tightly cowled warbirds. I don't have any experience with the front mount carbs and I'm not sure that I'm completely convinced of the theory I mentioned. However, if the theory is true, it seems from the postings of other members that the problem might be exascerbated by the front carb configuration that subjects the carburetor to prop blast. I don't think anything has been proven at this point and I doubt that it ever will be unless someone wants to pony up a ton of cash.