a perforating gun that has a detonator section in which a window is formed is assembled by : disposing a detonating cord in an inner bore of the perforating gun ; fixing a clip to a detonator ; gripping the clip with an installation tool ; inserting the clip laterally through the window of the detonator section using the installation tool ; and attaching the clip to the detonator cord by pressing the clip against the detonator cord using the installation tool . the clip has a planar base , an opening formed in the base for receiving the detonator , and a pair of prongs extending from the base , wherein each prong of the pair of prongs extends from an edge of the base and has a gripping end .