For the Uhing drive to function properly, the linear slide load carrier must follow specified design criteria. The method of attaching the linear bearing slide must be flexible. That is - it must allow the Uhing drive to “float.” There cannot be a rigid attachment between the Uhing drive and the slide or the Uhing drive can seize. Additionally, if you construct a linear slide load carrier yourself, the guide rails must be perfectly parallel to the Uhing drive shaft.