Hi Dave, no I have not found a solution to the takedown lever falling down. It and breaking the loading lever is systemic in the LeMat design. This seems typical for a first model design, kind of like Colts Paterson. Having said that, Pietta makes a pretty good representation of the LeMat (discounting caliber). Like the Paterson, it is what it is. Frankly, I find the quirks in early 19th century firearms charming. Managing the idiosyncrasies in use adds to the hobby interest.
I could fix the fall down lever issue, but that would require a kludge to the revolver. IMO that's not worth doing considering the limited LeMat shooting expected.
BTW, I watched Cold Mountain again and have on order The Quick and the Dead and The Warrior's Way that show the LeMat.
Regards,
Richard