Thanks for all this useful info
Sad to hear your problems with the screws etc stealthy
Replica screws can drive you crazy...as it more than once has done for me...but it can be fixed with a big enough hammer according to highflyingclive (below his picture of RWG member Gran doing just that back in 2004)
guess that should be DIAL numbers? and maybe you have a point that they appear a little far out (or maybe its just the curvatyre of the crystal making tis effect)...we need a ruler!
It seem they are not must be some totally other idea than Philip Dufour they copying...anyhow it is a totally different setup as the Dufor Duality is not a tourbillion at all (but double escapemt yes)
It is not for accuracy it is to unique and collectable = expensive
Truth is that even the tourbillon is not really that effective against gravity and yes two of these are not going to improve matter much if at all. It is just more complicated and thus maybe less reliable in the long run.