As they approached the counter Hal pointed out a display of oil cans. 'You could use one of those.'
  'What for? I'm a sealed unit.'
  'I was thinking about the ship,' said Hal. 'You could give my chair a squirt for a start.'
  'Is that so,' said Clunk flatly.
  'Yeah, it's got a squeak. And the cargo hold door's a little stiff.'
  'I'll tell you what else we can do with an oilcan,' said Clunk, reaching for the biggest model. 'If you'll just —'