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Just a thought, don't know if it would work or not. Depending on the position of the thumb latch when it's locked, could you cut a small block of wood to place in there so that it was kind of wedged in place.....or maybe even drill a hole in the wooden block so that the thumb latch fits in the hole (slides over the end of it) and the block being big enough to keep it from moving

You would definitely want to make it snug enough to stay in place, yet easy enough to remove quickly in case of an emergency...fire....???