The Shrink Fit/No Sliding contact simulates conditions like Separation/No Sliding with the parts in an initial state of interference.
The model has a ring that tightly fits the front frame and prevents the caulk tube from exiting the caulk gun when the plunger moves forward. The front face of the ring registers against the front frame without penetration. Therefore, this interface is simulated with the Separation contact.
The outer diameter of the ring has an interference fit with the front frame. The ring is press fit into the frame so that it remains in position without a caulk gun in place. This press fit allows the operator to push the ring out easily and replace it with a different size, as appropriate. The outer diameter of the ring and the front frame can separate without sliding. Since they are initially in a state of interference, the Shrink Fit/No Sliding contact is appropriate.
