Optional Foredom® Flex Shaft extra long inner shaft, the S-93-66,  is for use with the CC, L, LB, LX, LXB, R, RB, S, SR, TX.  Measures 66" so it gives you approximately 2 more feet of reach.  Must be used with the XL sheath - sold separately.  When you replace an inner shaft it requires a VERY light coating of Foredom grease (sold separately) before use. Be sure to UNPLUG your motor before doing any maintenance and NEVER operate your Foredom with the outer sheath removed.