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Here the problem is leather is flexible and absorbent and metal inflexible and impervious.
An impact adhesive is a good choice. As always ensure the surfaces are clean and grease free. Then apply the adhesive to each surface and allow to dry (as per the instructions). The two parts may then be put together and pressure applied to ensure a good connection. Allow to set as per the instructions.
This is not exhaustive and so please do email me if you have a question or even better an answer.