After completing
"A Mechanical Menace" and recieving
"A New Threat" (DLC01MQ02), you'll be asked to build a
Robot Workbench at any settlement after finding the
Mechanist Device at
General Atomics.I recommend crafting Ada's
leg armor and arm armor as they're low cost compared to some other mods. Unequip the mods after crafting, exit the workbench, drop the mods and re-craft them.