Abstract: A tool is for clamping a saver sub assembly of the drive shaft of a top drive drilling machine, in which a tong, which is arranged to fixedly hold the saver sub assembly by releasable abutment against a portion of the saver sub assembly, is arranged on an upper portion of a frame which, in a position of use, is rotationally rigidly fixed to and projects from a support, the frame being provided with a through-going center opening arranged to receive a substantial portion of the saver sub assembly. A method of replacing a saver sub assembly on the drive shaft of a top drive drilling machine is described as well.

Abstract: A tool is for clamping a saver sub assembly of the drive shaft of a top drive drilling machine, in which a tong, which is arranged to fixedly hold the saver sub assembly by releasable abutment against a portion of the saver sub assembly, is arranged on an upper portion of a frame which, in a position of use, is rotationally rigidly fixed to and projects from a support, the frame being provided with a through-going center opening arranged to receive a substantial portion of the saver sub assembly. A method of replacing a saver sub assembly on the drive shaft of a top drive drilling machine is described as well.