Cold or no cold wanted to press on, if Bradley can stand it I can.... whoops wait a minute.
Took out the shaft warmed the casing slightly and tapped the bearing outer race and shim out, cool the race and warm the casing and hey presto it drops in nicely little tap to be sure its home.

Set op the DTI and have a cuppa while everything settles to the same temperature, much prefer to use the DTI without a mag base if possible, much more stable and repeatable readings, modified the spindle of the mag base years ago so it has threads 8mm one end and 10 mm the other. still screws back in the mag base if needed.

Using a lever inside the box to lift the shaft up,took several readings averages at 2.26, so I am happy gap is 2.25- 2.26 mm

shim comes in at 2.35mm, so its a fraction big, but when I did the dry build it ran smoothly, it ran on a bit when I spun it but not freewheeling I will try again and do the spring balance thing.
Knocked out the input shaft outer races, to me they look to me as if they have been a bit hot so I decided to do check the end float on the input shaft, strip out the output shaft and wrap it in polythene.

Marked the bearing boxes to keep the inner and outer races together as they were delivered, shouldn't make much difference but best to do this.
Heat up the bearing inner races in oil then drop them on with a nice plop, allow them to cool.

OK similar set up to the output shaft.

More difficult to measure you need to be sure to use a lever and push the shaft well into the top taper bearing to try and stop it tilting. Averages at around 2.9mm for the end float.

But shim comes in at 3.48mm that's a pre load of 0.57mm surely too much

According to the manual pre load should be 0.05mm (0.002") like the output shaft. I wonder if that's the reason this box is in my garage and not slung under a discovery somewhere? Looks like I need to get a new shim or grind this one.