Also, everything that Graham said is exactly what you need to know for planning to modify your own slide. And I think that is what times design did best was have the way for the air to push past the emulsion tube at lower throttle positions. Just mark some holes to the edge of the slide that you can visibly see in the carb when it is all the way down. Make one on each side at one of the lowest spots you can see. I will see if I can get some pics of how Tom's slide looks at rest.