An assembly fixture device for attaching a vial adapter to a vial includes a base, a support member secured to the base, a handle connected to the support member, a vial adapter grip assembly connected to the handle and comprising an adapter grip member configured to engage and hold a vial adapter, and a vial grip assembly connected to the base comprising first and second grip members that are movable relative to each other and configured to engage and hold a vial. The first grip member is biased toward the second grip member to provide a vial engagement force, where the vial engagement force is about constant when a distance between the first and second grip members is less than 40 mm.