oil pump jack 3d model

A hyper‑realistic miniature oilfield pump jack designed as a keychain charm. Include highly detailed mechanical components: a precisely shaped horse head, realistic walking beam with structural ribs, counterweight with accurate geometry, pitman arms, gearbox housing, and a textured base platform. Add bolts, hinges, and industrial surface details while keeping all parts thick enough for 3D printing. Include a clearly defined, sturdy, circular hole specifically for attaching a keyring — the hole must be obvious, functional, and integrated into the top or rear of the model. Maintain true pump‑jack proportions, crisp edges, and authentic oilfield styling, but ensure the overall model is durable.