Thank you, yes I saw that myself too. As you say, correct measurements are the tricky thing - but I'm also perplexed by potentially being forced to 'make do and mend' . . . . on the other hand, perhaps I'm just being picky in wanting the correct & original part, which shouldn't be this difficult after all. The search will continue . . . . . but not for much longer, this is becoming an obsession and I'm reaching breaking point. Plus, the good lady is wondering what I'm doing all day and I can't tell her that I'm looking for a stud!I did a quick google for "ball head stud" and got heaps of results. It looks like they are actually relatively common, but you will need to get the measurements for a match.