Neither party hereto shall be bound by any rules, regulations, or oral agreements not covered by this Contract, except that the Employer shall be sole judge of Shop practices not mentioned herein and the Shop Steward shall be recognized as the representative of the Union. The Employer shall be sole judge of the qualifications of Leadworkers and shall not be restricted in any way as to the appointment or discharge of such Leadworker, provided, nevertheless, that mere designation of an employee as a Leadworker or any other title implying managerial or supervisory position shall not automatically entitle such employee to super-seniority and rights incidental thereto and shall not automatically remove such individual from the bargaining unit. Under no circumstances shall a Leadworker be allowed to administer a verbal or written warning against another Union member. Leadworkers shall continue to earn and use seniority.