i love kitted sachs. i also hate them, because they're a nightmare. but an exciting nightmare
my guess is the clutch nut is no longer attached.
see if it'll spin over by spinning the flywheel to check if you siezed. then pull the clutch cover off, don't bother draining it from the bottom, it's awkward to refill and will come out the cover anyways when you open it, so just put a catch pan under the cover and pull the 5 screws off, pull the cover off, pull the clutch out and rebuff the pads while you're in there (why not, the nut's already off) and then clean and degrease and loctite and toque that nut back on there HARD.