Pec Pad sandwich.
I've posted this many times. All you have to do is take two PecPads, make them the bread and your negative is the meat. Pull the neg through twice, load it into the carrier. No dust. I'm using a condenser enlarger now, and after several negs over several print sessions, not a single spot. Not even a small one. This is in my dusty, musty basement. Trust me, it works.