If we look back at the resulting assembly we have after applying the linear/linear coupler mate, we will notice that the part does not have a starting point from the backend of the outer shell. Also, the linear movements are not restrained for the two parts. To set a starting point and limit the linear movement, we will utilize the coincident and distance range mates respectively.
Before creating those adjustments, we need to suppress the linear/linear coupler mate we applied earlier. To do this, we can click on the mate in the design tree and select the suppress icon, as highlighted in the following screenshot. We will unsuppress the mate after adjusting the other settings:
Now, we will start by ...