Its humble pie time. I was not reading my own circuit sketches correctly, which is why I queried it on here, Very glad I did, although my main reason for the post was for the copper versus aluminium windings query, which is not meant as my excuse.
John H, you are of course correct as well; it's an induction job and my circuit was incorrect. I must try harder in my old age.
Thank you Swarf for your input and the previous post. Our sanders are identical apart from the motor fixing and mine is essentially nameless, but I know where it came from. Your motor is on extension pillars to the 3 (of 4) motor fixing bolts, but mine are on 3 separate cast-in frame extensions (See album). There is another apparent difference in that your motor windings look neat! Our connecting wire colours are identical and I can tell you that the white cap is 10Mf and the grey cap is 100Mf. The capacitors are even fixed in the same way, rather awkward to get at the single fixing screw. How on earth did you twig that the white wire from the relay contact went into the motor and came straight out again as a black wire (no internal motor connections) without taking it apart? My rewind will not include that feature! I will retest what is left of my windings again as you have the start winding at 6.6 ohms. Incorrect factor of two on my part as well it seems. I second your observation of the relay ID, I have the same single "up" help marking.
Its going to be a while for me to complete this little job in hand, amongst others, but I will let you all know how it goes. Thank you all for your input.
Dennis