A system for servicing a turbomachine casing, the turbomachine casing having adjacent segments joined with a set of threaded fasteners, the system comprising: a threaded fastener tensioning device sized to fit over ends of a threaded fastener in the set of threaded fasteners, the threaded fastener tensioning device including: a retention component for retaining a first end of the threaded fastener; and a tensioner for tensioning or de-tensioning a second end of the threaded fastener; the system further comprising a mounting system coupled with the threaded fastener tensioning device, the mounting system for retaining the threaded fastener tensioning device proximate the adjacent segments of the turbomachine casing, wherein the mounting system includes a mounting arm coupled with the threaded fastener tensioning device, characterized in that the mounting system further includes a rotatable retention component between the mounting arm and the threaded fastener tensioning device, the rotatable retention component permitting movement of the mounting arm relative to the threaded fastener tensioning device, the rotatable retention component including a locking mechanism for locking threaded fastener tensioning device along a range of angles relative to mounting arm. a threaded fastener tensioning device sized to fit over ends of a threaded fastener in the set of threaded fasteners, the threaded fastener tensioning device including: a retention component for retaining a first end of the threaded fastener; and a tensioner for tensioning or de-tensioning a second end of the threaded fastener; the system further comprising a mounting system coupled with the threaded fastener tensioning device, the mounting system for retaining the threaded fastener tensioning device proximate the adjacent segments of the turbomachine casing, wherein the mounting system includes a mounting arm coupled with the threaded fastener tensioning device, characterized in that the mounting system further includes a rotatable retention component between the mounting arm and the threaded fastener tensioning device, the rotatable retention component permitting movement of the mounting arm relative to the threaded fastener tensioning device, the rotatable retention component including a locking mechanism for locking threaded fastener tensioning device along a range of angles relative to mounting arm. a retention component for retaining a first end of the threaded fastener; and a tensioner for tensioning or de-tensioning a second end of the threaded fastener; the system further comprising a mounting system coupled with the threaded fastener tensioning device, the mounting system for retaining the threaded fastener tensioning device proximate the adjacent segments of the turbomachine casing, wherein the mounting system includes a mounting arm coupled with the threaded fastener tensioning device, characterized in that the mounting system further includes a rotatable retention component between the mounting arm and the threaded fastener tensioning device, the rotatable retention component permitting movement of the mounting arm relative to the threaded fastener tensioning device, the rotatable retention component including a locking mechanism for locking threaded fastener tensioning device along a range of angles relative to mounting arm.