优选地，成形器在打开位置和闭合位置之间枢转并且具有略微V形的基部，当V形的基部紧靠模具或模壳时促使凹部成形器处于闭合位置。

Preferably the former is pivoted between open and closed positions and has a slightly V-shaped base which when abutted against a mould or formwork, urges the recess former into the closed position.

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