I did something similar for one of my old squadron mates. I never expected to be paid for the labor, since I had lots of time sitting on alert to do it. What upsets me is 2 years later because of his wife and kids he still hadn't ridden the bike!!
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk