Did you have any issues removing the 510pin? I've broken a couple of clones with the smallest amount of torque trying to remove them, so I wanted to wait for someone like you to come along. How close is the airhole to the threads now?
Yeah, removing the 510 pin/tube was a pita.
It unscrewed (tightly) enough to take the positive block off, but then it didn't want to thread out of the base.
I used a tapered punch in a vice, then sat the hole end (top) of the tube on top of the punch to put pressure on it while I unscrewed it.
I found that the side holes in the tube had rough edges causing them to bite into the delrin/plastic - which is probably why it was so hard to unscrew.
A bit of the delrin came out and I could see it in the holes (which btw may cause airflow blockage when it's installed at the factory).
After I drilled those side holes out I just used a dremel with a drum sander bit to smooth the hole edges.
I have to admit, I was a little scared drilling the center tube. But it was already very close to 1/16". I had mine held straight in a vice and use a drill press. I chucked a rod into the drill press that fit inside the airtube to center it all. Not to mention the hole was already slightly off center from the factory. Maybe I just got lucky. I haven't drilled one of these tubes before.
I didn't take any pics. But I suppose I can tear it down tomorrow and snap some shots to show you how close 1/16" hole is to the threads.
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