The TA-110 is given a precision machined slit in the middle of the aluminium tube. A piece of Ortofon's special vibration damping rubber is inserted into the slit.
An armtube without slit and rubber damper is symmetrical in a vertical and lateral plane with respect to vibrations. The slit breaks this symmetry, and mounting the rubber insert gives the desired damping. The effect of the rubber damping properties in Ortofon TA-110 is a lot less stressed armtube than a conventional armtube.