If you don't know what you are doing I would advise you send it out for repair. The closing curtain has to be aligned exactly right or 1000th cannot be adjusted. Lathe overlap also has to be properly measured and there are other areas that have to be right.. Also curtain overall length has to be exact as well as tape length..

If you don't have the tools to properly align you will end up with a non-working parts camera..but then I get to buy them cheap and fix them right..