Sthil 028 chainsaw oil pump drive gear

This oil pump drive gear fits well on the Stihl 1118/01 .325" 7 Tooth drum/chain drive. It does not fit well on an aftermarket drum that I ordered. That drum has 5517 stamped on it and is a cheap aftermarket clone. I have included the .f3d file in case you would like to modify it in Fusion 360.