Is rubber eyecup for H1 prism finder user replaceable?

[rogerxnz]

Is rubber eyecup for H1 prism finder user replaceable? Or do I have to send the camera to a repair shop?
Roger

[Miller]

I have done it myself twice, on two different viewfinders.
It is a bit finicky, because the screws are small, but not very difficult.

[jerome_m]

The small screws can be seen by pushing the inside of the rubber sideways.