Also caused by wear in the cable and loss of rigidty of the inner core and inappropiate routing with bends of less than 6" radius.
As said can be taken apart and regreased but use a lithium white grease and wipe off the last few inches. This MAY help.
BagusJeep lives in Bali.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE