The Alexander French Horn Slide Fixer is a great little gadget for ensuring that your tuning slides return to their predesignated position. Easy to attach and adjust and likewise to remove when not required.
Due to the larger bore size of Alexander horns over other manufacturers, these slide fixers can be filed down by a repairer (or anyone with adequate tooling) to fit other makers' horns such as Paxman, Schmid, Yamaha, Holton and many more.