After years of use/abuse, the vinyl cutter has met its match.
Someone went full hulk and over tightened the blade clamp and it has threaded the screw, rendering it useless.
I am researching a fix, and will also look at a syllabus for the Summa (which is more complex and delicate at the same time)
But for now, apologies but the Cameo is the only current option for cutting vinyl.