Hi Graham, pity about your misfortune. I have an RZ, on which I put the WLF when in the bag. If I need the prism finder, I make sure to put the WLF back on when stowing it. There were covers made, but it may be that a cheaper option is simply to get a bag that the camera fits in. WLFs are easy to find and inexpensive, though. Focus screens should also still be relatively easy to find. If you can't find a focus screen, you may consider buying a body for spares. I see such deals coming up often, and they will typically go for the same as one or two useful spares.