Hand tighten with a bare hand and no wrench of any kind is what works for me.
You must have a better grip than I do. Mine is about gone due to 40 years of turning wrenches and carpal tunnel syndrome. I don't use an allen wrench because it chews up the jack - I use a concrete anchor bolt that's the same size as the original crank. I ground three flat spots on the shank for a better grip in the drill chuck. Works great!
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