Fishing stuck wireline equipment with stripped or damage internal and external fishing necks.
The upper sub separates from the top of the mandrel to install the slip latch and spring. The mandrel shaft tapers to a larger diameter near the lower end.
The slip latch is slotted near the bottom. When the slip latch is slid over the top of the mandrel it rests on the upper partof the mandrel taper. The spring slides over the mandrel above the slip latch, then the upper sub is threaded to top of the mandrel.