Re: too expensive
I think they are milled from solid and I expect a replacement would also have the three windows and rear viewfinder lens; might also have the hot shoe pre-fitted since it is sealed with silicone sealant.
It may be only 7 screws to remove it but then the shutter release, shutter speed dial, mode switch, LCD display and electronics flex print has to be moved to the new top and then everything tested. So it's expensive but not that expensive.
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Mark
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