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I believe paragraphs 1.3.021, 1.3.022 and 1.3.023 regulates design of fork and how bars should be mounted
No, it regulates where bars are mounted. Both Emma Pooley's 2008 Olympic/World Champ UKSI bike with fork crown mounted bars and the 2016 Avantis with struts joining the fork blades to the bars passed post-Lugano UCI regulations.
More importantly, article 1.3.006 says "“The bicycle is a vehicle with two wheels of equal diameter", so cutting the stem off the crown wouldn't make a bike with a small front wheel legal even if crown mounted stems were illegal, which they aren't.
obviously it is prohibited, otherwise it would be regulated.
That's not how the 45 page clarification of the 84 page UCI regulations works. If it's not explicitly prohibited, it is permitted.
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gbj_tester
http://www.uci.ch/mm/Document/News/Rulesandregulation/16/51/61/ClarificationGuideoftheUCITechnicalRegulation-15.01.2016-ENG_English.pdf
I believe paragraphs 1.3.021, 1.3.022 and 1.3.023 regulates design of fork and how bars should be mounted, and they don't mention possibility of fork mount, so obviously it is prohibited, otherwise it would be regulated.
@young_gun I think they sometimes just bought new frames, modern, and old were put in storages.