Agreed that I should have inspected more carefully before placing on track. Howe er, I have never had a problem like this in over 20 years so likely was complacent.
The larger problem here however, IMHO, is the manufacturer's response. Contrast with my experience with Menards when I received a damaged structure. Mark asked that i send him pictures and they promptly sent me a RA and paid the postage both ways. Quick, easy.
Paul