You are an engineering technologist employed by h. l. winman and associates, and you are engaged in a lake-level measurement program in northern new york state, working under government environmental studies contract wm-23357. at a critical moment in the program your hektik model 370 water stage manometer breaks down. you take it apart and identify that it needs a replacement spring and drive assembly. this is the third time this has occurred in the past six months, and each time the thread on the drive shaft has been stripped. you previously purchased replacement spring and drive assemblies from the manufacturer’s us office, hektik america inc., 21 lincoln st., chester, mass., on may 23 and june 17, at a cost of $218.50 each. (the model 370 water stage manometer is manufactured by hektik industries gmbh in dusseldorf, germany.) yesterday you faxed purchase order no. 26019 to the chester office, requesting immediate shipment of a replacement spring and drive assembly. today you decide to write to hektik america inc., to complain about the repeated failures (you may attribute the cause to any condition you wish, if you feel you need to point out the cause), and to request that the current replacement part be supplied free of charge. write a letter to customer service.