Now, I've hung back on this thread until now, because I have no evidence and have never actually used a 1R. Owned one, NOS in the box, but somehow it wandered off to someone into that vintage.
So, unconstrained by mere facts, but able to imagine myself as a stressed-out team wrench... Stress, of course, is the inevitable result of having to reconcile diametrically opposed beliefs or instructions, eh? so, I'm the wrench, and the team must use 1R stems - that's all we got, right, and the riders are throwing world-class fits about the bars slipping in sprints, so what do I do? What wrenches have done since time began: I fix the problem. I drill the stem at the clamp, run a self-tap screw into the bar, and, if time permits, saw off the head so pix won't show it. Problem solved: 1R is on the bike so sponsor is happy, no rotation, so rider is happy, time for vino and bed.
Isn't that how you can tell a real team bike 1R? :-)
harvey "master of funk & conjecture" sachs mcLean va usa.