Tape To hold the film to the spool. Any good quality masking tape will do nicely. To load film into the loader. You only need to do this once per 100' roll. Scissors To cut with.
Some people prefer to load their cassetes in a darkroom, by hand, instead of using a loader.
They do this because they are particularly worried about scratches on the film. You should definitely avoid any loader that loads film through a felt light trap. Not only can this wear and leak light, but if a piece of grit gets stuck in there, you will have scratches running along the entire length of every roll you load. The canister is the single most important part of the bulk loading setup. It is also probably the cheapest.