The regs state that the location tool is used to assist with the setting.
They also state that 'If the output shaft keyway and throw of the crankshaft are mis-aligned then the location tool cannot be used and in this instance the engine must be positioned at TDC using piston-stop or DTi method'
I've also read (probably a post on here from Kelvin) words to the effect that if the location tool and the gauge show a fail, then a more accurate method of setting TDC must be used to confirm the engine's legality.
I've personally set my engines using a very sensitive DTi (none of this 1.5 degree dwell during ineffective crank angle) and have wondered what would happen if they are checked using the location tool. I suspect I now know the answer so better take my DTi with me to race meetings so I can demonstrate to any scrut' using the location tool method that my engines are actually legal at a true TDC.
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