Concluding part of Fritz Keunecke's series on machine-made fancy laces, focused on thread tension in braiding-type lace machines. It covers how bobbin release affects tension and describes experiments measuring thread tension on a running experimental machine with a torsiograph recorder. Weight carriers are compared with spring-tension carriers at different turning speeds, with and without carrier stops. The summary finds that spring carriers keep tension steadier at higher speeds, while weight carriers show tension rising sharply with speed, and it points to bobbin release as the main cause of thread breakage.