In 1:32 with the WNW kits, I usually try to drill a hole 0.2 or 0.3mm in the centre of the control horn tip. This is just wide enough for rigging material to pass through, and then tied off/glued, trimming one end and leaving a longer length free to rig to the aircraft later. Much easier to pre rig before fixing to the model. Attaching the thread by looping through the horn may not be strictly representative of the real equipment, but works ok. I haven’t got a pic to hand