Yes, It is easy. Mine for no reason came out during a enduro. At the gas stop noticed oil all over the case. I talked to Jeff Fredette about it.He sent me one, The cost I think around 25.00 or so. It comes out the case from the outside. It has a rubber gasket around the glass. It just pops back in.
Make sure it is square when press back in. May tap lightly with socket that is same size. Mine has not came back out after 5or 6 enduros.