Tried that. Ended up making more of a mess. Hmmm.... Maybe sandpaper on a dowel will do the trick. If not, I may need to purchase some spare parts from you @JOATRASH FX
Did you use a drill that is just slightly larger than the holes? (0.5mm larger should do the trick) you want just enough to remove the little "hang" on one side, which is a consequence of printing overhangs. Remind me in a bit and can get you another barrel if needed. I usually don't charge for replacement parts, (within reason, providing they aren't huge print jobs) beyond asking for shipping.
Don't be afraid to use rough sandpaper (100-120 grit) on PLA. It's pretty tough. You could also use a round metal file.