Found a builder on VAF that invented an inexpensive alternative for push-pull cables through the Firwall. Had ordered the parts from ACS a while back (AN-832-3 steel bolkhead union, compression fitting and nut. Mounted the union in a block of wood and progressively drilled the holes to 3/16". Bought a few brass ferrules from Pep Boys, they appear to be brake parts and did a assembly check. When I am ready to mount I will pick a spot on the FW and mount the cable.