Carburetor Question - Is this a good call?

Perfect pics thanks Mattax - I actually tried to adjust that screw so there would be zero play against right where that red arrow is pointing to the arm.. I cant loosen it enough to make it have zero play.. I set up my phone and took a video of the carb when i was having the first aforementioned issue with vacuum and caught the adjustment we're discussing and caught that movement.. (ok cant upload a video clip so i'll take two screen shots.. one at rest, one with throttle - see below)

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Whats not obvious is that the arm for the accelerator pump DOES move.. just not a lot.. and no amount of loosening will make it really change anything visually on that movement.. seems to always make TOO much contact

Well that's it then. There's a big jump in position between the green cam and some of the others commonly used. You have to bend the pump arm or you might have to rotate the cam position up. Some cams have 2 holes, others 3. Same with the throttle. it has two countersunk holes. So this allows several positions with any cam.