Purchased for myself this non working & badly scratched Seiko 7S26-0030 which is a mid sized diver. Interesting project that was on & off my bench for a couple one months. New Seiko parts fitted dial, stem,crystal & bezel. After market parts the hands & mainspring. The only issue was when I fitted a GR2378X mainspring I had problems with the centre coil around the arbour slipping. I tried to reduce the final bend around the barrel arbour but it still slipped. I don,t know if