A Frame of Two Halves

I have those fitted. However, you end up with part of the splitter attached to the cable, which won't fit through the cable guide. The splitter grips the cable with a grub screw which crushes the cable, so if you remove the splitter to slide the cable through the guide, the cable tends to fray, and can't be re-threaded. Slotting the guide allows the cable to be removed whist half the splitter is still installed. It's what the proper frame builders do. we live, we learn.