Had an issue with my outer throttle cable being too short so to lengthen it I used automotive brake line tubbing. This stuff worked great just use a small tubing cutter cut off a short piece to get started use a small round file I got mine from harbor freight the set had like 7-8 tiny files in it. File out the burr in the piece of tube u cut. After that run the inner carb side of cable thru piece of tube u cut then run inner cable thru top of carb. Remember that ur first piece of tube might not be long enuff if so jst do sum visual an physical measuring an keep cutting longer pieces of tube till u find the 1 that works.