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For a Cannondale Headshok fork from around the year 2000, many have air springs which lets you set the preload just by adding more or less air. See the chart below for how much air pressure is recommended for different rider weights. Also remember you can set the air pressure for your riding preference too. This chart is a great starting point.
To inflate Headshok and other suspension forks and rear shocks, use a good low volume, high pressure suspension pump.
Search for Suspension Pump on CannondaleExperts.com