Ack! Yeah don't know if I'd use it enough to justify 43 bucks.
That's where I got the idea to run a die on some rods. I wanted ball-links as well for my giant scale plane. I ended up using the 4-40 die, but I wicked the interior of the dubro ball links with medium CA. After well over 100 flights they still show no signs of loosening. I put the control rod in a vice after I did it and tugged til my work table slid and the link held it's new CA threads. Figured that was good enough. That was a stop gap measure and wouldn't recommend it though.