Putting Sergent 1:64 Couplers on P-B-L cars
The trick I found to getting a secure Sergent Engineering scale coupler in P-B-L equipment is to add a 2.5mm O.D. styrene sleeve around the coupler screw to secure the coupler and allow a little play. I had to ream out the Evergreen styrene stock a bit to get it to fit, but has a great action now.