Thanks guys, especially Leigh.
I have been cutting for some time with the scissors on my little swiss army knife, but as I get older, I'm finding that less of a joy. I had an ABLON for a while years ago, and found it a little awkward, but the finished job was definitely superior to what I'm managing now.
I must try the trick of starting from the perf edge, rather than the end of the leader (my usual method). I don't want to start fiddling with business cards, or sticking fingers into the film gate, and a smooth leader is definitely the way to go.
I did see that pair of genuine ones on the video game, but they are just too expensive!