I recently bought a used pair of K-Line 4899 "American Red Cross" passenger cars. They are in good condition and seem like nice pieces, except for one problem: the couplers are much lower than on all my other cars. They end of decoupling anywhere there is a slight unevenness in my layout. The two cars match up well with each other, but they are definitely a non-standard height.
Has anyone seen a similar problem, and any ideas on how to fix it? I'm hoping to avoid duct tape. I tried bending it but there wasn't much give and it just reverted back to the original position.