As ii says in the title I have weighed a Zero One under drive or lightened crank pulley to find out the difference’s in weight between the 2.
Please beware I went brain dead as soon as I started filming so you have to do your own maths.
In this I used a stock ed20 crank pulley I didnt do an ef/el crank pulley as I didnt have one to do the comparison.
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584 grams 
thats a fair difference
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