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Definition of a secle. I'd hurry it up a bit or all the drink will be drunk. And the world might have ended.
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The Vero's I have feature a very small notch / tab / thing on the inside and a much more substantial one on the outside. I always assumed that this was to take a fair bit of the strain and the chainring bolts were to hold the chainring against these notch / tab / things securely. Admittedly none of this is based on anything other than assumption and the failure you experienced could be the chainring position or the chainring itself or something else. I have had crank bolts go pop a couple of times and the chainring didn't taco on either occasion. One of these times was going up swains lane, with all of my awesome power, so there was plenty of opportunity.
Looking for a 10 speed rear mech with a carbon face plate from either the Chorus or Record groupsets a few years ago. If you have one you would like to shift on (boom boom), drop me a PM and we can sort out a price. I can collect just about anywhere in London.