Service Tools - Rocker Levers Section 3 - Rocker Levers - Group 03 M11 Page 3-2 Service Tools - Rocker Levers The following special tools are recommended to perform procedures in Group 03. The use of these tools is shown in the appropriate procedure. These tools can be purchased from your local Cummins Authorized Repair Location. Tool No. Tool Description Tool Illustration Rocker Lever Bushing Mandrel ST-1284 Install and remove the rocker lever bushings in the rocker levers.