An adjustable bending force assembly is described for use with components that are securable to objects via applied bending force. In implementations, the adjustable bending force assembly is formed as part of a band that exerts bending force upon objects inserted within the band (e.g., between the ends of the band). The adjustable bending force assembly includes one or more stiffener elements that are adjustably positionable at multiple different positions along a length of the band to vary the amount of bending force. In one approach, the stiffener elements are configured as plates that slide into different positions to adjust the bending force. The adjustable bending force assembly may be included as an integrated component of a wearable device, such as a watch or headband. Alternatively, a band can be configured as a separate component to which a device can readily be attached and detached through manual force.