Because I always forget the step about positioning the lever after it's mounted on the tire. This is the sort of boring crap I tend to put on my private pages, but, hey, I want to be able to find this stupid page 5 years down the road...

• remove the plastic cap on tire (inner tube) nipple.
• if presta valve, open
• position valve shifter/lever on pump head in middle position
• place pump head on inner tube nipple
• shift lever from middle position all the way over^[1] to lock head into place: shifting lever after pump head is positioned on nipple ensures a good seal.
• pump tire.
• shift lever back to middle position & quickly remove pump head
• if presta screw valve shut
• replace cap on nipple
• put pump away

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Sylvus Tarn