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The flipping up sights must have been a problem when these rifles were used more in anger,my .577 Westley Richards falling block has the sight blades fixed down with tiny screws...

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Higher grade Westleys had spring loaded sight blades which helped to keep them in either the down or up positions.
The sight base was hollowed out and a flat spring, I would guess bent in a wave form to meet each blade pivot from the underside, kept pressure upon the blade. I envision each blade having little flats 90deg. to each other but I would have to see one apart to know for sure.
Really, quite a simple design and a wonder that all rifles with multiple sights didn't incorporate something similar.
Especially if intended for dangerous game use.

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He who lives in the past is doomed to enjoy it.

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