This is a Parallel$-$Jaw Nutcracker. Link $1-4\mathrm{.}5$ cm$,$ Link $2-7\mathrm{.}5$cm$,$ Link $3-3$cm: It is made to crack a tropical almond which on average is $4$cm x $2\mathrm{.}5$cm$.$ If the applied force is $60$N$,$ how would I solve for the: Link Cross sectional Area $($mm$^2),$ Allowable Stress $($Mpa$),$ Force from Nut $($N$),$ Max Stress $($Mpa$),$ Safety Factor, and Mechanical Efficiency?