Reference for Shabbat 225:8
אמר רב יהודה אמר שמואל כלי קיואי מותר לטלטלן בשבת בעו מיניה מרב יהודה כובד העליון וכובד התחתון מהו אין ולאו ורפיא בידיה איתמר אמר רב נחמן אמר שמואל כלי קיואי מותר לטלטלן בשבת אפילו כובד העליון וכובד התחתון אבל לא את העמודים
For we learnt: If one stores turnips or radishes under a vine, provided some of their leaves are uncovered, he need have no fear on account of kil'ayim, the seventh year, or tithes, and they may be removed on the Sabbath?<span class="x" onmousemove="('comment',' v. supra 50b bottom et seq. for notes. Thus we do not say that in removing them from the ground he makes holes. ');"><sup>19</sup></span> — In a field one will not come to level [fill up] the holes; [whereas] here in the house one will come to level the holes.<span class="x" onmousemove="('comment',' And for fear of this it is forbidden. ');"><sup>20</sup></span> R. Johanan asked R. Judah b. Lewai: As for a weaver's implements, e.g., the upper beam and the lower beam, may they be handled on the Sabbath? They may not be handled, answered he. What is the reason? Because they cannot be taken up [moved].<span class="x" onmousemove="('comment',' Even on weekdays, owing to their heaviness. Hence they are utensils whose exclusive purpose is a labour forbidden on the Sabbath (cf. p. 167, n. 8.) ');"><sup>21</sup></span>