When installing and removing pedals I use the technique of squeezing the wrench and crank arm together between my fingers and palm. I get surprising force for tightening and loosening the pedals that way. No cheater pipe or long wrench is needed. Even with a 5 inch Allen wrench I can fully tighten my pedals (from behind) and never have trouble loosening them the same (reverse) way.
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Robert
No matter where I go, here I am...