Iwata are utterly brilliant mate, I bought my HP-B a long time ago, infact I think my Dad bought it for my 14th birthday so 24 years ago, I've not to buy a new nozzle ( cos I dropped it out the window cleaning it and despite searching the garden for 4 hours it didn't turn up, new needle cos I dropped it without the air cap on it and had it services one to replace the air valve after running it on the airline at college and getting a lot of metal filings in it
So my advice to you is get an Iwata, pay out now, worry about it never again !