Polariod mounters will work on snap slides
I certianly dont mount a ton of slides. Whe I shoot E-6, I process the roll, and aftger loupe viewing on the light table, I thread then into a polaroid mounter. I keep a few of the polaroid mounts, becasue that sets the correct slide length when cutting sequential slides.
Otherwise I use a pair of claen cotton gloves, and pick the slide film pieces up after cutting and snap them into brand x - or slide them into old ektachome slip in mounts that I find in a lot of the trays when I buy up carousel trays at estate sales.
The polaroid mounter and 300 mounts came from *bay a few years ago for $14, Before that I used cltton gloves and scissors. Slow but for the 5 to 10 slides out of 36 that I shoot and am really happy with taht works too.