Hi folks, could you do me a favour and measure the thickness of the head/flange of your chainring/hanger bolts. I'm using them to fasten some 2.5mm sheet metal and wanting to counter bore the heads flush. The ones I have are ~1.5mm, can anyone point me in the direction of some thinner ones? 1.5mm might be as thin as they get due to the design spec? Cheers!