The present disclosure provides an actuation device that comprises: (a) a device body that comprises a first fixation mechanism configured to affix a proximal end of a first elongate member of an accessory device to the device body, (b) an actuator that comprises an operable mechanism and a second fixation mechanism configured to affix a proximal end of a second elongate member of the accessory device to the actuator, wherein the operable mechanism is configured to move the second elongate member relative to the first elongate member, and (c) a fastener configured to attach the device body to an endoscope. The present disclosure further provides endoscopic systems comprising an actuation device of this type in an assembly with an endoscope and an accessory device, and also provides kits that comprise an actuation device of this type and one or more accessory devices.