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Also assuming that this is a UCI-compliant answer
It's a "physics problem" answer, so the ballast goes inside the frame where it can have no effect on the aeros, and the glue is both massless and infinitely strong and rigid, so the spherical(d=17mm)ballast can neither move, despite the single point contact, nor affect the structural properties of the frame.
gbj_tester
Oops, meant to say 'relative magnitudes' there. Also assuming that this is a UCI-compliant answer, such that 'turn it into a fairing' would get you on the naughty step.