Hello; I just bought an 'ELECTRAMAC EM450s' McCulloch chain saw (medallion) with a 14" blade at an auction. It did not come with an owners manual but I discovered it needed a small part to tighten the chain/blade. Can you tell me the closest place I can purchase parts? I live in Livovia, Michigan, 48152. my email is rustystub@mi.rr.com thank you Bob