Need VBA to unprotect range of form control checkboxes

I have form control checkboxes in a specified range on a worksheet named "PayAdj" (cells c23:c1000). I need to unprotect them so that when the worksheet is locked, users can still "check" and "uncheck" the checkboxes. There are too many to manually unprotect by right clicking "form controls" selecting the "protection" tab, then unselecting the "Locked" box. I have searched far and wide for a solution, and attempted to modify similar VBA code but failed. Now completely frustrated. Can anyone help?