youll need somehting to go into the throttle base or that housing wont have a stop.
take the extra barrel adjuster off the throttle side.
get a really small knarp. (treats) take the throttle apart and cut the end of the cable off and add the knarp down the cable to take of the slack. the knarp will still be too large and grind inside the throttle housing. so be sure its where you want it.
then grind a mm-ish of each side of the knarp and put your throttle back together.
literally just did this on 3 hobbits. maybe get an extra knarp.