Brother INSTAFAX FAX2100M - Manual (Page 46)

III-5. LOADING PAPER
2) Insert the plastic paper handlers into the ends of the tube
holding the paper. (When replacing an empty paper roll, be
sure not to lose track of these paper handlers, as they are
necessary for fitting the roll into place in the machine.)
3) Load the roll of paper into the machine, inserting the paper
handlers so they fit firmly into the sockets provided, as shown
in the illustration. Check to be sure the paper is coming off the
roll correctly, from the bottom, not from the top of the roll.
IiI-5-2