An electrical stimulation device has a sensor for detecting a movement event of a body part and an electrode for making electrical contact with an area of the body part. The inlet means is adapted for the introduction of a reaction mixture into a reaction chamber, and a means for introducing at least one viscosity controlling agent into the supply means is provided to form a reaction mixture with monomers andor oligomers. The sealing arrangement comprises two annular sealing elements applied at an axial distance from one another and adjacent to the connection region so that the sealing elements are each in continuous contact with a surface of the shaft around the whole of their inner radial surface and in continuous contact with a surface of the hub around the whole of their outer radial surface. A method of using a computer chassis comprising providing a computer chassis and interchangeably coupling one of a rack mountable rail and a tower base mount to the computer chassis at least partially with a tool-free coupling member. Instructions for the CMM can be inputted to the CMM arm by an action chosen from the group consisting of placing the arm in a predefined position and moving the arm in a predefined manner.