This could be a useless suggestion (I'm full of em), but on my 48 chevy I epoxied a magnet to the engine oil plug. It was just rebuilt so it seemed like a good idea. It picks up any metal flecks circulating in the oil. When I change the oil I wipe off the magnet. Admittedly I haven't tried this on my Tw cause I haven't seen my oil plug yet (new to me 2001 tw with 5600 miles). Probably all the metal is gone by now, but you guys with new bikes might benefit. You who know might be rolling your eyes at my ignorance. Hopefully you'll dumb me up. Thanks for the great forum!