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Particularly: “What relation is there between 錘, 槌, 鎚, and 椎?”
Removed from the daily use Jōyō kanji by the Japanese government in 2010.
As in historical on-readings ending in -ゐ, such as "ゆゐ" and "るゐ", most dictionaries do not have "すゐ", "つゐ", and "づゐ" as historical readings for 錘. According to historical data, the on-readings of 錘 are the modern "すい" and "つい", as well as "づい". However, the Dai Kanwa Jiten, has the -ゐ historical on-readings.