First, Glen, what is (or was) that device before it became your needle tool? Then... how do you use that tool (not the micrometer... the whole thing)?
I don't have Stromberg parts around here to measure so again, I fall back to SUs. These are more naive questions and suggestions. I KNOW this has been asked before by others so please feel free to correct me and put me straight.
With SUs needles the taper diameter is measured in thousandths of an inch every 1/8" along the length of the needle and I am assuming that is the way Stromberg needles are also characterized. If the inside diameter of Stromberg and SU jets are the same, could you not use SU needles in Stromberg carbs? Sure you would probably have to bush or turn down the mounting stem diameter but if the jets are the same size it could open up a whole world of possible needles.
Since the link to Paul T's needle page was posted earlier, there is another one that you might find helpful. Once again, this is for SUs but it may prove useful (if not now... in the future).
http://www.mintylamb.co.uk/suneedle/
The Mintylamb utilities will let you graphically compare different SU needles. This gives you an idea how lean or rich one will be compared to another at various amounts of carb piston lift.
Doug L.
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