Along that line some folks use electrical tape to fasten the wire to their reel spool. This may avoid putting on backing. I have always used a section of 30 lb Big Game mono to "nest" the wire and keep it from slipping as well as offering some protection from direct pressure of the wire on the spool itself (also recommended by reel repair folks). I think you should be able to fit the 1,000 ft of 7 strand wire on that reel if you go with either the taped approach or just a short section of mono (say 50 ft.) as backing.