The DT-51654 is a holder that includes a detent pin and two mounting bolts that secure the damper housing and input flange. The holder is first secured to the input flange with the bolts, the detent pin is inserted into the damper housing to prevent rotation, then the holder with housing is placed in a standard shop vice. The holder locks the damper in place so that the six bolts that retain the damper to the input flange can be torque to yield using an angle gauge. This tool would be used in both disassembly and assembly of the damper