I emailed the Cannondale tech line and got the following response:
All Headshok cartridges use a wiper seal system the cartridges are not
pressurized. Running them locked out for extended periods of time will cause
the seals to leak.
The lockout feature is designed to avoid bobbing when you are climbing. It
is not meant as a conversion to a rigid mountain bike.
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Thread: Headshok Lockout Revisited
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