Not much progress this weekend. I've finalized the nozzle design and finished machining the first half of the nozzle. I orderd some stuff from McMaster-Carr including the screws that I'll need to retain the nozzle and bulkhead in the casing, those that will attatch the two nozzle pieces, and the O-rings. I still need to pick up some steel bar stock for the ring/shoulder half of the nozzle.
Here is a render of what the finsihed nozzle will look like: