Rocker arm recommendations?

IQ,
Your post 79: 'To assume that the roller tip acts if it was welded is wrong'.
So what would happen to the open & closing cycle IF the roller tip was welded??
Other than the roller skidding across the valve tip, the rocker action, rate of lift, motion etc would be exactly the same as if the roller tip was able to rotate.
My point was to demonstrate that throughout the rocker's cycle, the actual contact point of the roller [ on the valve tip ] changes. It is this point of contact of the roller to the fulcrum pivot [ this length ] that determines the valve side ratio. It changes & is NOT constant. It is triangle: [1] one side goes from the fulcrum pivot to the roller pivot [ & I presume this length is used to calculate the advertised ratio ]; another side [2] goes from the fulcrum pivot to the point of contact on the valve tip; the third side [3] goes from the roller pivot to the contact point on the valve tip.
[2] & [3] change throughout the cycle.
'The rocker always transmits the force in a line parallel to the valve stem from the center of the roller'. Yes, correct. But that is the FORCE. Not the ratio, see above.