I have a 1978 Peugeot 103, got it out of a junk yard. It is very complete and in nice condition. It does not run. no electricity. I want to remove the magneto because it looks pretty crusty in there . I have removed the magneto retaining nut, my question: Is the magneto itself a press fit item or a threaded fit item?. What is the correct procedure for removal of the mag.