Yes, it is in the instructions, and I do have the 1mm spacer. But…
The spindle bottoms out on to the back of the crank, as it is designed to, there is a rubber washer that compresses to take up the slack, I’m just worried that it is not thick enough to stop the cranks butting up against the bearings. ie the spindle runs out of thread before the washer starts to compress.
I have checked the bb shell width and I do have the right amount of spacers in both the BB and on the cranks, there just seems to be a fraction of play when everything is nipped up!