The ornamental design for a rotatablearmassembly for forming a paperpad, as shown and described.
FIG. 1 is a top plan view of a rotatable arm assembly for forming a paper pad showing my new design, the bottom plan view being a mirror image of that shown;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof, the right side being a mirror image of that shown;
FIG. 4 is a perspective view thereof;
FIG. 5 is an additional perspective view thereof, with the assembly shown slightly rotated; and,
FIG. 6 is a left side elevational view thereof, the right side being a mirror image thereof.
The broken-line disclosure of a vertical support and toilet paper roll shown in the views is for illustrative purposes only and forms no part of the claimed design.