lathe rotational part 3d model

Create a precise 3D printable mechanical part based on a technical drawing. The object is a symmetrical rotational part (lathe-style geometry) shaped like a spear or bullet tip mounted on a cylindrical shaft. Dimensions: Front head: - length: 70 mm - maximum diameter: 30 mm - shape: smooth elongated teardrop / bullet shape - perfectly symmetrical along the center axis Neck transition: - length: 10 mm - cylindrical - diameter: 18 mm Shaft: - length: 40 mm - diameter: 14 mm - straight cylinder Back mounting pin: - diameter: 8 mm - length: 14 mm - centered on the same axis Total length about 134 mm. Important requirements: - perfectly rotationally symmetric - smooth surface - no textures - no decorative elements - solid watertight mesh - optimized for 3D printing - real scale in millimeters Style: simple engineering prototype, matte plastic or resin look. no holes no patterns no text no extra shapes no asymmetry no organic sculpting no surface noise The object must be modeled as a lathe / rotational sol