After doing some searching (and with some help), it seems people are routing a slot for the metal ILF insert piece. Seems like a no brainer decision after someone tells you how to do it.
At the same time, if you dont have router/table and a drill press, it probably costs the same to buy a used mini-mill like grizzle or central machinery as a decent router/table and drill press ...
my .02 .... maybe I can convince the boss I need a mill in the apartment now ... we'll see.