Since I only have the one powder measure for my B, what is the recommended way to empty it of powder when I am changing to a different powder? 

Also, just curious, does the clear tube fit into the base by friction?  I have an older SDB from around 1989, and I noticed that the tube tends to come loose on the base.  I suppose I could drill and tap a hole to mount a set screw into, but I'd just as soon not.  I notice that the XL-650 has a set screw on the base to hole the tube in place.

Thanks for two great products!