To get , switch to what the Japanese pros call the yururi (gentle) cast:
Use a zirconia crucible and cast under pure argon (O₂ < 10 ppm). Even 50 ppm oxygen will form a titanium oxide layer that looks dull grey—the opposite of a “smile.” sumiko smile casting better
Not every metal works equally well. when the dynamic viscosity is between 0.08 and 0.12 Pa·s at pouring temperature. Aluminum A356, Zinc ZA-8, and some magnesium alloys perform excellently. High-copper brasses tend to be too viscous; reduce pour temperature by 15°C if needed. To get , switch to what the Japanese
Unlike a standard jig head or Texas rig, the Sumiko Smile features a free-swinging offset hook with a molded "smile" weight that sits perpendicular to the hook shank. This unique design creates an erratic, fluttering fall that fish adore. But that same design introduces aerodynamic drag. Aluminum A356, Zinc ZA-8, and some magnesium alloys
To assess the performance of Sumiko Smile Casting, we compared it to two other casting methods: