The next question is how to hold the outer cable so the inner cable can move in and out and raise/lower the slide. Just two weeks ago I encountered the same problem on a Trackmaster frame...fortunately I have a lathe. I cut the top flat and drilled out the threads. I made a ferrule out of steel and drilled it just big enough to get the cable fitting through it. I cut as big a radius on the ferrule as I could so the inner cable would have as gentle a curve as possible to go over. Then I made a bracket using 1/4 alu plate using the two bolts that mount the rubber flange. It goes upward as high as I could go, parallels the top frame tube, then drilled/tapped it for the standard Mikuni cable adjuster. This hole also needs a slot so the cable can be lifted out whenever needed. It is easy to remove and adjust the cable. Then I made my own cable. Best I could do.