Yikes, I'll never go exploring inside my Lancaster. What a bunch of cool little bits for me to foul up.
The gun has functioned perfectly since Toby's restoration. It is tough to close. I find by holding further out on the barrels when closing gives enough extra leverage to close-n-cock without too much effort.
I have noticed after a round with the Lancaster, my standard pattern guns "fly" shut. It does take a few stations to readjust to the norm of cock on open.
I couldn't find anymore data other than what has been posted. (Still loooking)

Joe