There seems to be a general consensus that the first area to address is the hook/hinge pin to pull the barrels rearward towards the breach face. How would one know if the proper amount had been added? If too much was added it would seem an unnecessary amount would need to be removed from the barrels to get the gun to close. I understand barrel material might need to be removed but how would you determine that amount before addressing the the barrels?

Thanks for you input.