All mechanical slide cores to be fitted with a clothes peg style retainer to ensure they remain in the mould open position while mould is apart. For bigger sliders, 2 retainers to be considered. Choose size of the retainer according to slider characteristics. See following pictures for preferred slide retainer types.Mechanical sliders on the bottom of the tool or moving downwards must have bumper (if the pin of the peg breaks the slider can’t fall down)