You're in Vic aren't you? This bottom crown looks like it would fit.
I don't think your verniers are too good either the ID for the bottom crown of a standard 1 1.5" should measure around 39.7 ~39.8.
https://www.bamcycles.com.au/fsa-15-lower-headset-crown-race.html
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Thanks for the possible lead on a crown race, unfortunately, the OD of the steerer isn't something a standard 1.5 crown race would fit.
I should have rung the shop and asked them to get their verniers out and measure the crown race.
wasted a couple of hours getting out to the sticks and back. should have got it posted.
However shit my verniers are, they were probably close to 38.1mm for the OD of the fork steerer. The 39.7 ~39.8mm ID of the FSA crown race was never going to fit. we could both see that it was loose on the steerer.
The shop mechanic tried to be helpful, but I had already dealt with the distro, who also tried to be helpful but couldn't find me a crown race to fit a weird steerer diam.
IS there someone in Melbourne (or interstate) who could turn me up a shim or a crown race that would fit, and work with the standard FSA integrated tapered headset I bought? the top parts fit fine, inc top bearing, and the bottom bearing seems to fit fine.