I have a EIG Model E 15. Would like to get it back in complete working condition. I realize it is nothing special, just sentimental. I don't know the proper terminology for the parts, but I will try to explain. When I point the gun up and cock the hammer the cylinder does not rotate. Pointed down it does. There is a little lever that falls forward and rotates the cylinder. I think there is supposed to be a spring on it that is either broken or missing. The gun looks like a Colt Buffalo Scout I think. Can I get parts to fix it? It belongs to my father-in-law and I would like to give it back to him in complete order. He said he bought it in 1968. BTW, I didn't break it. This is how it was when he gave it to me to clean and hold. Any advice would be appreciated. Thanks.