Grooves in Delrin tips

[MacDiver]

I have one of each of the long and short Delrin tips. I've enjoyed using them and plan on getting at least a couple more.

However, I've noticed a little problem. There are horizontal grooves on the inside of the Delrin tips from the machine process. This causes juice and condensation to dam up on them so it doesn't move freely down the tube. Is there a process that could be used to remove the grooves, making it smooth or add some tiny vertical grooves that would help the liquid to drain more effectively?

 

[forcedfuel50]

Tips are turned and bored on a lathe so sometimes you get some fine radial lines from the bit(s). I do suppose one could take a dremel tool and polishing stone/wheel and hand smooth out the inside or some sort of hand laping. I'll take a look at some and see what works good.