My first attempts were using sections of original plastic tube for friction fit, like Bic. Then I used a mandrell and turned them and plugged the end. Glued in a 1/2" section of plastic.
Like these two:
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These were ok. I wanted more. So, I ordered a set of 6" drill bits from Grizzly. The blanks are step drilled. One size for refill. One for friction fit of refill ball point end. This is not a one-use, in that it's on it's 2nd refill! Turned on lathe with hole in live center... It does want to "whip" so a steady rest is in the works. It's 12" long.