Mainer, it seems you are right, the D1 oiler, as they are called seems only to be available in metric pressfit you can get them with imperial treads, but not imperial pressfit, i think i will have to settle with these
From this store http://www.rdgtools.co.uk/acatalog/Button_Oilers.html
The price is right, hope the quality are as well. Anyone who knows of this store?
Jason, you posted while i was writing