I have a marple's gamegetter 1921 model that I inherited from a gunsmith friend. It came to me in pieces and is missing the cocking spring assembly. Parts are not obtainable, so I want to make this part. I need a diagram or picture of it to proceed. I can guess that it is similar to a cooey single shot shotgun or a savage model 24. Can anyone recommend a place to get a diagram or does anyone have one or a picture. Thanks Richard