be made on a fourslide machine which is preferred for keeping the manufacturing expense low a support surface 40 is preferably a circuit board having established conductive paths 35 and 36 there are countless ways that electrically conductive paths can be designed on a circuit board 40 or other support to read identities from an array of memory buttons 20 they all require a single signal line paired with a neutral line a contact spring 50 of much lighter gauge than gripping spring 30 is preferably mounted on circuit board 40 within base coil 31 to extend up to a region within gripping coil 32 to electrically contact a plane face surface 22 of memory button 20 contact spring 50 thus contacts an electrode of memory button 20 while gripping spring 30 contacts another electrode of memory button 20 so that id numbers of memory button 20 can be accessed simply spring 30 in addition to providing electrical contact with a cylindrical perimeter 21 of memory button 20 also grips and releasably holds memory button 20 by the frictional grip of upper coil 32 the springiness of the wire of spring 30 allows upper coil 32 to expand slightly when memory button 20.