Adjusted the 10" blade on my new (to me) SIP table saw so that it tracks parallel to the mitre slots.
After much, much to-ing and fro-ing, and cranking my hand to get at the 4 near-inaccessible bolts that clamp the motor assembly to the table top, and checking the offset twixt mitre slot and a 3 foot steel ruler clamped along the plane of the blade, multiple times, I got it to <0.3mm over a distance of 450mm. Close enough, methinks.
Good job I'm retired, I'd never have the time to devote to this if I had something else to do in the day.....
Now, on to finish the cross cut sled so I can cut stuff without losing my fingers at the same time.