Johnno wrote:What a tedious pain in the arse.
If you factor in the clip positions how many possible variables could you have for needle tuning?
Too many thats how many.
As above, the last digit indicates the physical diameter of the straight section.
The difference between an NECJ and NECW in the same clip is just the diameter of the straight section.
The difference between an NECJ and NEDJ in the same clip position is that the NECJ is a half a clips leaner.
Given that there is overlap in the circuits, and the influence of a longer straight section in these needles to the OEM ones, then a shift to a leaner clip position can also influence that the diameter is responsible for. As such the chart you have listed shows the staggered order. JD does the same thing with it's Blue (rich) and Red (lean) needles in it's instructions; albiet they are more than just one diameters change between them.