An external adjustment device includes at least one permanent magnet configured for rotation about an axis with a first handle extending linearly at a first end of the device and a second handle at a second end of the device, the second handle extending in a direction substantially off axis to the first handle. The blocks may be quickly pulled away from the track and the barrels by pulling the closure member, and the closure member may thus be quickly disengaged from the track, and may be wetted or dipped into water and may thus be engaged onto the users while in emergency condition, such as when on fire. This leaves the other hand free to manipulate a hysteroscope, minimizing the number of health care professional required to deploy the contraceptive device.