Where's my lock out gone?

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Hi I’ve got a Manitou black (SUS FORK) with lock out.

My problem is the lockout facility seems to have disappeared.

The lockout lever on the shock used to set lockout as you turned it left to right ,

Any body experience this problem and get any answers.
Thanx Howard:confused:

The problem has been solved with an oil change,which i have to admit was long overdue.:)