I have a mixed bag of cars that have a kadee type of knuckel couple with a stiff curved wire. Yet while some are similar there seem to be variations in them but all have a stiff wire like an air hose. What is the wire for? Many or these open and will not shut and some seem to have been stuck in a closed postion. I have for, example engines with there couplers by Atlas Bachmn and Athearn also cars by round house, accurail, bachman, branchline to name a few. I am about ready to put a drop of super glue on them to hold them shut as I have done on O ga cars that refuse to funtion. I also have a number of used cars that need couplers or tructs but require differnt types of kadee like units yet all are differnt under the car frame some one type wont repair them all. The cheaper cars with the hook like couplers work the best for me. I am resigned to connecting all manualy as a rule. Any ideas on what I can do to make the hobby more fun and less frustrating?