woodchuck,
The "bolt" you see in the slide is a screw in retainer for the needle. To remove the cable compress the spring toward the cap, hold it compressed with a pair of needle nose pliars on the cable, there is a plastic sleeve at the slide end around the "bolt" that has to be slid toward the compressed spring, sometimes this sleeve stays in the spring, now slide the end of the cable into the slide slightly and toward the slot in the "bolt" at the same time removing the cable. When reassembling make sure to align the notch on the plastic sleeve with the slot in the "bolt".
MIKE 2000 KTM 300MXC eastern wash.