Mark, Got a feeling there are websites detailing guys who’ve made their own darts, the sort of guys who can put three in any bed from 12 feet. The materials are difficult to work and you’d ideally have to cut an internal thread, tricky but not that difficult ,in the barrel to screw the flights on. You could always use a tap for this, in fact thinking of the diameter ,you’d probably have to.
. You don’t have to use titanium and you’d learn knurling and a lot of turning skills. A minilathe or maybe even a microlathe would do the job (if you go for one a minilathe would be the better choice as the bigger you get the more other useful things you can do on it. but beware-I don’t play golf anymore because I find machining much more interesting-you might end up not playing.)
In theory you’d need a v.good lathe to really accurately match the darts but do you need them that accurately matched ? -Bristow used to be pretty good well before darts went hi-tech. and hi-tech clubs never did that much for my or anybody else’s golf. Its the singer not the song.
Learning machining is not that difficult especially if you are pretty practical. There’s a guy on another forum I use who bought his first lathe six months ago, dived in and got on with it, asked us a lot of questions-and I would say he’s pretty good now ,and giving good answers to other new guy’s questions.Nearly every one is this hobby is unusually helpful.
Try Googling ” Darts DIY” that might find you something.