Dubro packages an adjustable 4-40 pull-pull kit with enough wire to outfit a couple of 28-30% planes. It's a crimp system. That Great Planes kit looks heavy, which is something you typically don't need at the back of a plane. SWB sells some extremely nice threaded connections that permit very fine adjustment of cables. Again, designed for crimps. AirWild also has similar parts for the job.

Don't be afraid to perform crimps on pull-pull wire installations. All you have to do is follow the directions that come with each product to do a good job.