The throttle control end if making one you would need to braze or silver solder a small lump on one end of a Bowden cable then file or grind the end down to fit into the throttle control ,the other end you can use a small bolt and drill a hole for the cable to go through then tighten the nut.
Sometimes I would just grab a car boot release cable at a wreckers and shorten the cable to fit.
If you don't have the tools to braze an end on the cable then a cable from something else must be used and the end ground down to fit the control. You can buy a new Victa 18 cable but will be about $30.
I think a Pit Bike throttle cable may be too short but you could search online for a longer cable.
