Keilim 21:3-22:1

Keilim 21:3

If one touches the handle of a saw at either end, he is rendered ritually unclean. If he touches the string, the cord, the cross-piece or wedges, a carpenter’s vice or the bow of a drill (used to spin it), he remains ritually clean. Rabbi Yehuda says that one who touches the frame of a large saw also remains ritually clean. If one touches a bow string or a bow, even when the bow is stretched, he remains ritually clean. A trap for moles (which uses a bow) is insusceptible to ritual impurity. Rabbi Yehuda says that when it’s stretched (i.e., armed), all the separate parts are considered attachments to the dart (and therefore susceptible to impurity).

Keilim 22:1

If a table or a sideboard was damaged, or if one covered them with marble, but room was left to put cups, it remains susceptible to ritual impurity. Rabbi Yehuda says that in order to remains susceptible, there must be enough room to put pieces of food.