[boyt911sc]

The green viton o-rings have very tight fit on the cylinder and crankcase mounting holes. Even with Dow grease, pushing them in without any mechanical aid takes some effort. When installing collapsible return tubes, I find it helpful to install clamp/s (as collar) on the tube and use it for leverage. Find something like a wrench or plier to push one end at a time by tapping it with a small hammer or similar tool. Once the greased o-rings starts to slide in, you'll feel it gets harder to pull out. Keep us posted.

Tony