Every time you sit down or bump into something it pops out which defeats the purpose of the tape holder. The bottom of the metal on the retainer shouldn't have a large protrusion, this protrusion prevents the band clamp from holding the band, I understand it may not fully engage or it may be too strong for thin leather, I would recommend changing the design that way Noting that half the metal is sticking out, or pointing out that this item only works for very large tape measures less than 30 feet, doesn't have a large enough clip to hold it in place.