Fwiw, when I say the Magnum's needle is sensitive, I mean one click is too rich, one is right on, and one click more is too lean. Sometimes tapping the needle, or wiggling it for a "half-click" is the thing to do. It's not a big deal if you pay attention. Also, I have some "how to make a Magnum run right" instruction on my website at www.MidAtlanticCombat.com.

The LA has a broader needle, easier to avoid lean runs.