Ah, designed for extensions which have a different OD to handlebars (22.2 vs 23.8mm). Also expensive.
Ah, a #Chickenleaverpuller!
IR, a bolt on sprocket would be fine, nobody could argue that it isn't securely fixed. Besides it's more likely that I'd be made Pope than a bike would get that serious a scrutineering for a TT.....
@Colin_the_Bald started
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Ah, designed for extensions which have a different OD to handlebars (22.2 vs 23.8mm). Also expensive.