Thanks both.
(edit) - Measuring the other new "Austin 7" ones I've got, they are all 0.745"ish which are exactly the same as other 19mm/ 3/4". What size should the head aperture be when new?
I see also that both brass, stainless and mild are available. Is stainless recommended just because they survive better, or are mild steel ones recommended because more malleable? I'm not sure what material the standard recommended suppliers ones are - zinc plated mild?
https://coreplugs.co.uk/19mm-mild-steel-...earch=19mm
(edit) - Measuring the other new "Austin 7" ones I've got, they are all 0.745"ish which are exactly the same as other 19mm/ 3/4". What size should the head aperture be when new?
I see also that both brass, stainless and mild are available. Is stainless recommended just because they survive better, or are mild steel ones recommended because more malleable? I'm not sure what material the standard recommended suppliers ones are - zinc plated mild?
https://coreplugs.co.uk/19mm-mild-steel-...earch=19mm