No internal supports. I am absolutely sure straight grained wood does not need any tubing, as it is stronger than resins. And I think/hope I won't have any problem with this tough burl wood.Do the wood cylinders have any internal support ? What threads did you use ?
Exactly, it is a roll stop. I did not want the flowing line being disturbed by a clip.I especially love the little nib feature on the cap (assuming to keep it from rolling?)!