What if the fixture is the wrong size? Can I return it? May 10, 2019 19:21 Standard fixtures can be returned for exchange or refund if they have been unused. A restocking fee may apply. For more detail about our returns policy click here. Related articles What is the delivery time for an Assembly Fixture or other tools? How heavy are these fixtures? What will it cost to have them shipped? Modelers have building switches by hand for years. Why do we suddenly need an Assembly Fixture to do this? What is the projected life span of an Assembly Fixture? Building Turnouts Using Fast Tracks Assembly Fixtures.