I changed the oil on my 06 Mastiff, and like an idiot put in the tappet screen upside down. Rode for a while, then started to hear a strange noise coming from the engine. rechecked the fluid, seemed to have an air bubble in it or something, refiled a bit. Noise still there. Then I decided to look at the screen, it was upside down, and the screen bent up pretty good. So, I'm thinking I did some damage to the engine, and now have to take it in to get looked at. Only have 3500 miles on the bike. I am always so careful with everything, so pissed at myself. Followed GasMan's DIY. Anyone with ideas what I could of screwed up, and what this might cost me? Thanks.