Whoa, this confuses me here. Other than screwing the thing on what do you have to do? Also, what version did you use?
The m2 has gotten a lot better from what i've seen too. The hardmount kit that they sell helps quite a bit. It still loses a stop more light than the sgpro though.
I haven't used the brevis yet but am very interested in it.
To get the SGpro perfect, it takes some tweaking. It has to be used with rods, etc. Set-up, while faster than the M2, is slower than the Brevis.
ash =o)