This is a little helper to assemble new push-rods for your delta
it is designed to fit for M3 screws
i used 6mm Rods and couplings for M3 Bolts
to assemble:
print 2 of the helpers
mount them on a extrusion (M4 bolts for example)
orientate the 2 helpers as parallel as possible
you can measure the outer holes for the bolts to look for that.
After that: bolt all of the couplings to one side, i used M3x12, directly into the part
then fit the rod and the coupling of the other side one after the other
i glued them with uhu endfest 300, with that you have enough time to assemble all rods
orientate every rod, keep fokus on aligned rods and make the couplings parallel to the base
after that: wait until the glue is hardened
with that method all your rods should have the same length (deviation due to theo M3 bolt and the diameter in the coupling are there)