Can you post a foto or two of the coupler?The truck/coupler assembly on this car (from the late '60s snaps into the underframe with the trucks riveted to the metal spring. The couplers are in a pinned metal enclosure. I'd like to update to Kadee trucks and couplers. Any thoughts will be welcome.
I think you will have to press or drill out the pin on the coupler box. Then use a #51 drill to make a hole the right size for a 2-56 tap. If the metal is too thin to take a tap, then use a 2-56 nut. Then either replace the metal cover with the coupler lid from a Kadee #5 set, or if you want to use the original metal cover, then use a spacer from a Kadee #213 coupler box set so the #5 coupler won't wobble on the 2-56 screw.Here's what they look like.