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Need to purchase small diameter metal tubing with screw-on flush endcaps?

Hello,

I am looking for a supplier that sells metal tubing, steel, very small inner diameter with threading inside and end-caps that screw on to make it flush and appear as a solid metal rod (rubber O-ring if needed to keep dry).  I am attempting to make paracord survival key fobs.  I want to fit various tiny survival gear inside the tube, closed on both ends then weave the stitching around the rod.  When needed the user can unravel the paracord for use with what's inside the tube.  It must be tubing because one of my ideas is to put thermite inside a tube, wrap some magnesium ribbon around the outside, then stitch the fob around that.  Other ideas include other types of survival gear but that one will be my fire starter fob.  :)   The rods would be about 2-3 inches in length, wall diameter thin but sturdy, inner diameter maybe 1/4 - 1/2 inches.  Thanks for any help.  Rounded end caps would work fine as well as they would give me more room to stuff things in, but I need access to the suppliers for both the threaded tubing and end caps.  :)

Cigar tube.

British 303 oil bottle goes in the butt of the gun.

There are a range of oil bottles made for guns that would fit the bill.

This one is a bit much I can get them at my local gun show for $5 so shop around.

http://www.gumtree.com.au/s-ad/glenvale/collectables/brass-303-oil-bottle-oa-marked-ww2-australian/1014902725