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My Dads early sixties Harrington and Richardson .22 revovler. He had just found it in his basement and told me that it had never really fired all the rounds, upon further inspection i realized the plastic end on the mainspring guide assembly had broked and gotten filthy. so i researched a bit and found plastic and steel replacements for it at $25 a pop, but the metal ones were out of stocvk, well i figured the plastic would most likely break again so why not make one myself. it took some time, especially just using some hand tools and a drill. but i had fun getting some practice in. and in the end i think it will turn out good.