It seems to me the NarDa would be one of the easier rda's to put on a drill press and bore out the air supply... It could even be done free hand if someone had a steady enough hand. Any good machine shops in your area?
Not to necro.. lol.. but I just fired up my Narda after hand drilling. I used number drills to slowly take it up a size at a time, then wiggled the slot to keep it slotted.
It was just sitting around unused. I was tired of the poor airflow. It is rocking now! First drill was a #47, last was a #30/.128"/3.25mm. Probably used every 3rd drill. Broke 2. It's a FOG machine.
Rocking a single SS316l 4mm I.D. spaced coil @1.05ohm in TC. Center of coil is just above center of big air slots. GOOD flavor too.
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