After failing to find much online help about troubleshooting the Passap Duo80 I went back to the studio on Saturday afternoon and loosen a few screws. I tugged and shuffled the locks and suddenly everything was moving again. So I tightened the screws again and changed the needle that broke to release it all. Luckily I had been given a massive box of needles along with all the other gadgets and add-ons I've yet to figure out. Also luckily, changing a needle is very straightforward and much like it was on the Toyota machine I had 30 years ago.
With a sigh of relief, I cast on with my practice yarn and knitted a fairly scraggy bit of lambswool rib. That's proof it will work once I work out what I'm doing. We'll see what happens over the next few weeks - there might even be some prototypes and samples ready by Open Studios Weekend 2&3 August.