Reference for Shabbat 250:5

אמר רב יוסף ומותבינן אשמעתין אם לאו אין ממלאין בה ולא היא התם כיון דלא הדקה בטולי בטלה

it [the barrel] becomes a stand for a forbidden article.<span class="x" onmousemove="('comment',' Sc. the stone, which may not be handled. ');">⁸</span> Whereas it. Joseph said in R. Assi's name in R. Johanan's name: They learnt this only if one forgets [it there]; but if he places [it there], it (the stone] becomes a covering of the barrel.<span class="x" onmousemove="('comment',' Hence the stone itself may be handled and removed, and it is unnecessary to tilt the barrel. ');">⁹</span>

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