I had to wander around my house for ideas, but I think I've got it! Your solution is...
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login...plastic knitting needles! Maybe.
Get an appropriately very-small-gauge plastic needle at the craft store (bring your BB along with you to size-check), then using clippers, cut the tip off off to-length. File the bottom of the tip down flat with sandpaper, then
carefully glue it in place with a tiny dab of superglue. Beforehand, if you really want it to have spiral-y grooves, you can try filing them in with a rigid nail file? That should be good enough, if you totally don't want to try sculpting!