Lucas Auto Advance Distributors

[Graham Barker]

I measured the amount of advance available by twisting the distributor rotor with a protractor sitting on top of it. I then filed the holes in the plate to be oval and remeasured the advance angle. With consecutive filings followed by remeasuring the angle, I eventually obtained the amount of advance that I wanted. 
Bear in mind that one degree of advance at the distributor rotor is two degrees at the crankshaft.