What is the "L" dimension in a Uhing drive?

In a Uhing drive assembly, the L dimension is the distance between the outside edge of one end support to the outside edge of the opposite end support. The L dimension determines how much travel is possible in a Uhing assembly. The converse is also true -- the amount of travel desired will determine the L dimension. The L dimension is important because the mounting holes used to anchor the Uhing assembly are located in the bottom of the end supports.