Hello, I just purchased a used boat with a 2007 90 hp Mercury 2 Stroke Engine. It hadn't been used much. When I started it up it made a screetching sound. According to a mechanic at the local boat shop, there were shavings present under the cover and that came from the bendix. He showed me the sharp edges on the bendix and said it would be best to replace it to avoid further damage. What is your opinion? This sounds pricey but I could only imagine it getting worse. How many hours of labor should be charged to replace a bendix? Thank you in advance!