Got an email back from Alex today as i was enquiring about 1mm pencil jets; he has some left but is making new size pencil jets, his comments below looks good.
I'm using fans but as we get into colder weather and maybe putting salt down i'm looking to leave less water on the ground.
Use 1mm pencils before and liked, but broke 1 of em and then switched to fan jets.
Alex's comment:
"I am working on a 1.4mm jet size which is almost exactly half the flow rate of the 2mm pencil jets and will fit the same size jet hole. These will be with us in about 3-4 weeks"