design and analysis of a staple pin remover

Sounds like homework.

1- you make a functional analysis and define working and other functions one has to respect (ergonomy, environment, aso)

2- you define the required forces

3- you make several attempts to define the most promising cinematic and make the choice on a comparative study considering series and available technologies

4- you make the drawings and check if on paper it has a chance to work properly over 50%

5- you build a prototype and test it

6- you make all necessary modifications according to prototype tests

7- you are congratulated for your good results.

Congratulations maybe, but more likely a grade that will depend upon how thoroughly Guest completes the assigned design project.

In other words:

Get out yer pencil, skippy!