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Well, if your horizontal drive wheel is 1/2 metres in diameter, you really need only a bit more than 1.5 metres (2*R*PI)...
Also, some people cut the thread in the plasticified edge of the wheel using hand drill and standard tap, I saw it made and it is easy, provided the job is properly prepared. Or, the thread can be impressed into the edge of the wheel, filled with epoxy resin. The possibilities are countless....
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