Hey guys I have a 05 Avalon xls and last week it was time for my first oil change. The oil filter cartridge assembly was new to me. First I drained the oil then I went to remove the small bolt at the bottom of the filter when I tried it actually started to turn the whole canister so I had no choice but to remove the whole piece and let the oil drain out over the edge. After all the oil drained out I went to stand up and I dropped the canister it was covered in oil and it slipped out my hand. The parts inside came out of the canister it looks like a metal tube with holes the other part was a small metal piece the size of a quarter. I didnt know how it came apart so I put it back together the best way I thought it should. Then tonight I'm working in the garage and I found a spring on the floor! I know it must have gone in that filter canister piece. Anyone got any ideas? Should I drain the oil and take it apart again or should i just wait till the next oil change to put the spring back it? I think all it does is hold the oil in the canister until you remove the bottom bolt and insert the plastic drain tube. Any ideas guys? Thanks!!!