Lock the bar path and hammer your triceps with a narrow grip.
Keep your elbows tucked in, not flared, so the triceps take the load over the chest.
Narrowing your grip to shoulder width and tucking the elbows shifts the press from the chest to the triceps, and the Smith machine's fixed track keeps that groove identical on every rep. The chest still assists off the lower-chest touch point, but the tucked, close-grip lockout is a triceps event. It earns its place as heavy triceps work you can push hard solo, with the hooks there whenever a rep dies.
About shoulder width. Going dramatically narrower does not add triceps work, it just wrecks your wrists. Hands stacked roughly over your shoulders with elbows tucked is the sweet spot.
Tucked elbows bring your forearms vertical lower on the torso. Touching at the lower chest keeps the elbows under the bar, which is exactly what loads the triceps instead of the shoulders.
It complements them. Close-grip pressing loads the triceps heavy with chest assistance, while pushdowns isolate them completely. Press for strength, push down for focused volume.
