Issues replacing complete balance assy on Seiko 4R36A
Hello everyone - I messed up the hairspring on a Seiko 4R36A when my tweezers slipped while moving the adjustment stud. As the NH36A is identical to the 4R36A, readily available, and fairly inexpensive, I purchased a complete NH36A and transplanted its complete balance assembly. I had both movements sitting next to each other, removed the balance plate screw, gently lifted the balance wheel from the plate, and very slowly moved the entire assembly with the balance wheel hanging freely to the o
Having power in the mainspring is up to you, but letting it down with the click spring makes it easier because when it has power you can make it bank to the other side when trying to seat the impulse/roller jewel.
Although the way to hold the balance assembly is highly subjective, letting balance dangle for the only purpose of installing you will not have any issues with Seiko. i can guarantee you will be more likely to damage the pivot or the hairspring trying to hold the assembly together
