After a mainspring for a Seiko 6119c
They have them at cousins but are a bit expensive £16.50p, however, I also found one at £7.95.
So my question is what's the difference?
with a watch like this , i find that running the movement while immersed in naphtha works well.the moving parts and solvent tend to carry the crud away, depending on how dirty the watch is you might want to change the naphtha two or three times or until it stays clear. then dry and oil.