As the Hammer Hits the Pin

I will cut myself to pieces
I will write a letter first
I will slice off all the extra
I can't tell you where it hurts

All the times I pulled it open
There is no difference in it now
I will mutilate my terror
I swear that I know how

I could barely pick it up last time
But I've taken some licks
I will make a change inside
As the hammer hits