This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 槖 is uncertain. It appears to combine 木 (tree/wood) and 石 (stone) under a cover-like element, but the original meaning and component relationships are unclear.
The kanji visually contains 木 (tree) and 石 (stone) under a cover. Its meaning is unclear, so treat it as a mysterious container holding wood and stone.
For タク, imagine a tack holding together a wooden box with a stone inside: tack -> タク, and the box is the mysterious 槖.