I have more tools than my local dealers
(got to laugh, it'd be worrying otherwise...)
Iansoady, thanks for the offer
The critical diameter is 46.006 – 46.012 mm (1.8113 – 1.8115 in)... I'd need a shortish length of steel turned down to that (OD), length not too critical, so long as the machined part is longer than 1". I'd also need a ring (~1/2" thickness) with that as an ID too... what do you reckon? (I'll do some drawings in a bit haha)
I'll give Cymarc a shout too, thanks for the reminder Juv