A friend of mine fixed a leaky spigot by using a short piece of inner tube as a gasket. You won't use up too many inner tubes doing this, but it's a good trick to remember. I've also used it in place of a bungee cord to tie stuff to my bike rack.
Have you looked at the inner tubes and made a determination if they can be patched? For $3 you can go to an auto parts store and get enough rubber cement and patch to fix about 10 bicycle inner tubes.
I am pretty sure if you were to pull off the tires on my tractor just about every wheel has 3 patches holding the inner tubes together. Its not a junk tractor either, its just that an inner tube that holds air is just as good as a $700 brand new tubeless tire.
I know it is a dying art, but I still patch inner tubes, still buy tubes when my tubeless tires go flat.
Farmers here use long strips of it as emergency leak reapair bandage , stretch wrap around a leak in the pipes and then bind it down with blue bailing twine --or orange if you prefer--boyh seem to work as well as the next, the dairy farms have pipes running everywhere and when you no water or no pressure at milking time thats a problem.
use them for exercise. cut out the valve (could cause wounds) and (if needed) tie with a simple knot to a loop.
you can use pieces as anti-movement-mat to secure (wood-working) workpieces to the table/bench. you may need to cut it open (just one layer, not 2). it helps when working with a router or when clamping workpieces to the bench/table.
you can use a piece of tube to put over your clamps. over the thing that grabs unto the workpiece/wood.
when you clip/screw battery-powered lamps unto your bike handle..... hmmm.... it might work for nearly everything where you fix something on/unto a round(ed) handle/pipe/bar etc. ... where you would need some extra grip in the connection
i have cut strips of tractor tube and used them to tie newly planted trees to stakes , found the easiesr way to cut thick tube was with my 4 and half inch grinder and using a ceramic tile cutting disc mounted on it , a used worn out one , or one of the cheap types that dont have much of the abrasive layer on them from new worked best---just draw a line with bright marker or chalk and as you cut gently pull one edge away from the cut line , hardly any amount of melted crumb is created .
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