A pivot in a linkage includes the pin in the figure whose dimension $a+-t_a$ is to be established. The thickness of the link clevis is $1\mathrm{.}758+-0\mathrm{.}002in.$ The designer has concluded that a gap of between $0\mathrm{.}006$ and $0\mathrm{.}020$ in will satisfactorily sustain the function of the linkage pivot. Determine the dimension a and its tolerance.

The dimension of $a$ is $$ in$.$

The tolerance $t_a$ is $$ in$.($Round the final answer to three decimal places.$)$