In article om, fotoobscura wrote:

Any ideas? I don't want to go in the direction of defeating the
mechanism, of course.

There is usually a little microswitch located somewhere in and
around that catch. They're typically adjustable by loosening a
screw or two, sliding into the right place, and retightening.
The adjustment is usually pretty critical -- the microswitch
needs to be in the right position to within some fraction of
a millimeter.

If you can locate that microswitch and gain sufficient access
it will likely be quite easy to adjust by someone who is
reasonably adept with electrical and mechanical devices.

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