I have an OS-H 40 engine which was converted to spark ignition however the spring which controls the moving contact is broken. The conversion is made of brass and looks to be a comercial unit. The advance/retard arm has a knurled aluminium knob. I took a couple of photos but not being a computer person I do'nt know how to include them here. I am hoping that someone can tell me where to get a new spring. Although I could not post a photo here I am capable of sending them to an email address.
Cheers
Barry[/img]