May one use the sides of a tree or items attached to a tree's sides on Shabbat?

ShabbatRabbinic Decrees

Synopsis

Using the sides of a tree (tzidei ilan) is forbidden, but using the sides of things attached to the sides of a tree (tzidei tzedadin) is permitted. A peg in a tree is 'sides'; a ladder leaning on the peg is 'sides of sides.'

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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