a compression assembly tool having multiple split bases for attaching connectors of different sizes to corresponding coaxial cables of different dimensions by compressing the connectors axially . the tool uses a light rigid o - frame and at least two pairs of split base supports located at different distances from a compression plunger driven by a lever handle . the handle is spring - loaded to the open position , but is held in the closed position by a wire bail for storage . the pairs of split base supports have annular bearing surfaces of different diameters that support the back of different connectors over a full 360 degrees . the split base supports are pivotally attached to the body , are held closed by a spring and are easily opened by squeezing push surfaces located on the split base supports towards each other to pivot the split base supports to the open position . the split base supports have stops to bring them positively into correct alignment with the axis of compression when the split base supports are released and return to the closed position .