Glenn, yes the DDK needle and the JD Jetting blue tip needle have the same straight section diameter and both of them have a very similar L1 length, but this is where the similularities end. Both needles have very different taper profiles (DDK = single taper, JD = triple taper). If you were to measure the JD needle as a over all straight taper (average from start to the end of it) it would be....., well only close to the "D" taper needle.
Comparing the DDK needle taper to the JD taper, the DDK needle taper starts out richer (JD needle starts out leaner than the DDK). At the L1 point they are the same. There is a point in the middle of the taper that is close to being the same. At the wide open end of the needle taper the DDK needle is richer than the JD needle (JD needle is leaner than the DDK).
Another thing to take note of, is that the taper on the JD needle starts sooner than the DDK needle. Even though both needles have a similar L1 length, the LI length is NOT the starting point of the taper. The L1 length is a point measured on the taper where it is measured to be 2.515 mm in diameter to the top of the clip #1 groove.
I hope I said this in a way that can be understood by most of you out there.
Ron
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