A few months ago, i had a problem in my engine that caused some internal gears to grind away part of my engine casing. this resulted in loads of tiny metal filings floating around in my engine oil. my mechanic said that i have to keep changing the oil until all the metal filings were gone. so for six months now i have been draing my oil every other ride and throwing new stuff in. this is rather expensive even when you buy the cheap oil and it's annoying. so i had heard of magnetic oil drain bolts and that got me thinking, instead of buying one becuz i have no money, would it be possible to weld a small magnet on to my drain plug? this would aid alot in getting the metal filings out of my engine if i could do it. any suggestions?