Trevor!!
This is from you:
"The voltage is specified as 0.45 -- 0.55 volts. I had no trouble in setting things at exactly half a volt."

I'm in the book and at closed throttle it list 4.4 to 4.8 VDC. The smallest value given is 0.7 VDC at WOT

Is this corrected in a TSB? (fingers crossed)

Collins