Hi Elaine, Thank you for your question. As you face the 79250-SS paper holder the leftside mount has the arm attached, the rightside mount has a small post that the arm rests on when closed. To replace the roll the left mount with the arm swings up and open to allow the empty roll to be removed and the new roll added.
Thanks,
Dave
Answered by: DeltaFaucet2
Date published: 2014-09-10