Aluminium tubing for staff

Hi guys and gals, I am thinking of making myself a fire staff to play around with since I have some spare poi heads lying around that should be fairly easy to convert since they are tube cores and have a nice convenient piece of tubing already on one end.

That being said I need a little advice. Im planning to use some aluminum tubing to make the staff itself and wanted some recommendations on how sturdy it needs to be. Being, as I am, somewhat restricted by the internal diameter (due to the fact i need to insert the existing tubing on the poi head through this so I can bolt it on securely) and also by the external diameter (if its too big I wont be able to hold it properly) I am a little worried that I may end up with a staff that simply wont be strong enough.

So I guess the question really is, how thick do the walls of the tubing need to be to give it enough strength?

I've already dealt with the issue of how long to make it by doing a search and reading various threads on that but any further advice on materials etc would be of interest, thanks in advance

Motley

Edit: The internal diameter of the tube must exceed 2cm for me to be able to insert the existing tubing I have into it and bolt it on, failing this I could go smaller and use an aluminium dowel and drill through that but I was kinda hoping to avoid this if possible.

Edit 2: PS the reason Im using these poi heads and not making them up from scratch is because the poi heads I obtained free (chains broke on my poi so they sent me a whole new set hence the spare heads) and there is a matter of cost in making them up from scratch, im hoping to do this for less than £20 if I can

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