I bought a "running chainsaw from e bay a few weeks ago and sure enough it runs OK. However the chainbrake does not stay off once you try and latch it back. close inspection of the latch shows there may be a part missing but I cannot find a workshop manual anywhere No labels or markings on the machine but i reckon it is at least 7 years old. it s a two stroke manual choke and a toggle on/off swith there is also a fuel pump square button on the front. A foot plate under the handle for starting purposes . It is painted yellow and the chain bar is about 14 inches......If there was a site with pitures I am sure I could identify the blighter. Can anyone help by narrowing the field down or pointing me at some web pics? I would be most appreciative.