I Purhased A stihl 036 That Was A Non Runner To Fix Up To Add To my collection The Saw Came Without An Airfilter ( It Needs One Compatible With The Air Compensator On Bottom,I Got The Saw Up And Runnning And Got An Air Filter But Now The Air Filter Cover Does Not Fit Right Since I Installed The Air Filter ,I Assume Someone Changed The Carb At One Time To A Compensated Carb And The Old Filter Didnt Fit So They Just Put The Cover On ,Has Any One Ran Into This And What Cover Do I Need