What Clive says is true in terms of ease of loading the spiral the first few times, but IMHO it's well worth practicing doing the whole process in the dark and removing the film by dismantling the cassette. As it is, the film gets dragged through the light trap twice anyway on the way out and then back in, each time having the potential to cause tramlines/scratches if the trap has picked up any particles of crud. Taking the cassette apart avoids hauling the film through the cassette jaws a third time. For that reason, I always wind the film right back into the cassette if it is to be processed commercially (as with slides for me). Against all of this is the argument by some that the light trap is more effective when film protrudes through it....... !
Originally Posted by cliveh