Abstract: There is disclosed a mounting assembly for positioning a roll of sheet material within a dispenser including oppositely aligned receiving sockets wherein said roll of sheet material is formed on a hollow core, comprising a first arbor member formed of flange member, a core insertion member coaxially mounted on the flange member and positionable in the hollow core of the roll of sheet material and a socket insertion member coaxially positioned on the flange member on a side opposite the core insertion member and positionably in one of the oppositely aligned sockets in the dispenser and a second arbor member comprised of a flange member with a centrally positioned orifice, mounted to a core insertion member having a cylindrically shaped chamber, positionable in the hollow core of the roll of sheet material, a socket insertion member including a collar disposed within the chamber of the core insertion member and having an end thereof extending through the orifice of the flange member and positionable in one of s