A six inch pocket square is too big?
I highly doubt that. lol
Just don't be ham handed with it and it will tell you all you need to know.
Yours works too. But if you have a pocket square handy why go through all that?
There is no compairing a mini carpenters square to a razorblade when it comes to a straightedge.
Making a razorblade is a precession process
These gaps should be to small for a square correct?