Simplex Retrofriction were a common upgrade from Campag record in the early 70s due to smoother and lighter action (true as well, not a myth) although to keep sponsors happy in the pro ranks they often disguised it by using the rubber Campag covers
It also does not require constant tightening that the Campag tend to do.
I mod my Retrofriction with an Allen bolt so I can experiment with torque setting and see what the lowest I can go without it coming loose.
@Big_Ted started
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Simplex Retrofriction were a common upgrade from Campag record in the early 70s due to smoother and lighter action (true as well, not a myth) although to keep sponsors happy in the pro ranks they often disguised it by using the rubber Campag covers