I've been away from this lawn mower repair project for a few weeks but I did manage to get all the parts I need. I'm doing some final cleanup, lapping valves and so on before reassembling everything. I have a question about the oil seal. On this motor the seal is kind of a metal honeycomb disk covered in a hard plastic. I'm having a heck of a time getting the old one off. I tried prying it out with a chisel but I'm at the point of not wanting to gouge the aluminum block. Anybody have a tip for removing this? I tried to drill into it to put a screw into it and pull, but it is a metal, probably aluminum gasket so I stopped. Again, this is for a GCV 190.