Thanks to all for the replies. Very helpful. Tim, there is a very good reason why link couplers are not as likely to work well as knuckle couplers. Link couplers were made of acetate plastic with a stearic acid mold release agent mixed into it. The acetate plastic has shrunk considerably over time, especially with the migration of the stearic acid to the surface (that white stuff). Knuckle couplers were made of styrene which is only now beginning to shrink very slightly sometimes. In short, link couplers tend to shrink around their pins and bind, and coupler knuckles do not tend to shrink around their rivets, but move freely.
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