Thanks, problem is as above its a door and battery contact all in one, just made a copper one with a sprng on it for now to get him going so will keep thinking and see what we can come up with.perfect wee job for a 3D printer....
Great idea but coke top is too bigCut the neck off a coke bottle just below the flange under the cap.
Glue the flange onto the viewfinder over the battery compartment.
Fit a spring into the coke cap with a nut/bolt/washer.