MikeSeale wrote: Sound like you have a similar setup to the all moving tail in my Phase 5.
hobbyking.com/en_us/threaded-ends-m2xl20mm-10pcs-set.html
You could then use a ball link or a standard clevis assuming you had enough clearance at the tail end to include the coupler as well as the clevis/ball
Following on Mikes suggestion, Ive solved the problem by silver brazing a wheel collet to a threaded adapter then re-tapped the m3 grub screw threads and filed matching indents on std piano wire.