You know, hindsight is roughly 20 / 20. I've been busy with last minute honey do's and don't's before my wife returned to Russia for awhile. Looking over these oxygen bottles I suddenly realized a simple, slap me up the side of the head, solution to making them. As noted above, I've tried to round both ends of the same piece after cutting them off the styrene rod. Not exactly easy but doable. Then it hit me. Cut off the already rounded end, make another rounded end and cut it off. Sand the unrounded ends untill the two pieces are half the needed length. Place the two flat ends together and wick the liquid glue in. Done, no worries. I should have thought of this earlier...