To avoid kinking, I've "heard" of filling the tube with sand (I've done the sand thing on other small tubing, soapy water (fill the tube, plug the ends, and freeze /soap allows bending without an immediate shattering of ice), and 3mm / 0.120" weed trimmer string. The ID of the tube is spec'd at .120". Assuming this will take a few attempts, I'd try string first followed by sand. You can also use anything like talcum powder. Cool video on frozen water method or you can start at the 3:28 mark.
https://hackaday.com/2013/01/21/buil...l-metal-tubes/
Additionally, you can go to a hardware store, pick up a couple of small pulleys, wood screws, attach pulleys to a board and use that to assist you. You can probably use a couple of thread spools in place of the pulleys.
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