in the few weeks he had been there , he had already begun a number of fairly typical scams - shortchanging gas customers who looked as if they might be in too big a hurry to count the bills he gave back to them , running the remould game ( which consists of charging the customer for a new tyre and then actually putting on a remould and pocketing the fifteen- to sixty-dollar difference ) , running the similar used-parts game , plus selling inspection stickers to kids from the high school and nearby horlicks - kids desperate to keep their death-traps on the road .