FWIW mryy .. I tend to think we all over-think what could be special behind SB's. They are just 'linear' levers that obey the Law of Levers and at the same time since they are levers used for doing Work they are also "Simple Machines". We can venture down the rabbit hole that they must have hidden powers that enables something extraordinary to happen in regards to Work Input verses Output, but in my experience that just isn't the case.B. stated in MT that there was something special about the stork's bill (SB).
What is so special about it when implemented in an OB type wheel?
Recurring problems for builders are getting the levers on the ascending side to lift up and over 12:00 and observing back rotation (due to spring compression, lever/weight movement, etc.).
Does the presence of the SB eliminate or mitigate these problems? Could this be what B. was indirectly addressing?
So what could B. be suggesting that's special behind them, if they are just prosaic simple machines ? It must be the action that they can physically perform imo and not any 'super power'.
B. shows in MT the two common such actions which can be seen in the TP (lhs figure E) and MT-54 (also figure E) .. both extend the SB by application of a force.
The difference is that in the TP the SB extends with pressure on the handles - the important differentiation imo being that all the pivots in the arrangement move forward with the extension and retract with compression. Whilst in MT-54 a main pivot/fulcrum is anchored and the SB extends in both directions from that fulcrum. Much like and X or <x> can be extended or compressed relative to this anchor pivot.
Following my line of deduction (optional) a force applied in one direction returns a force applied in the opposite direction i.e. a linear force direction change ability is it's 'special' physical and mechanical quality; perhaps an important actor in a multi-cast production that work together to generate an extraordinary result foretold in the TP comments, imo.