I use the back to mark the mortise.      I use the back to mark the mortise.    I use the back to mark the mortise.
I use the back to mark the mortise.

I use the back to mark the mortise.

I use the back to mark the mortise.      I use the back to mark the mortise.    I use the back to mark the mortise.
So, you always wanted to build handsaws...
Slotting Fixture
Slotting Back
Stamping Teeth
Making a Handle
Assembling the Saw