650 G2 doesn't fit in new copper module

I got some copper aixiz modules, and my 650 G2 lens doesnt fit in it???

Is there somthing wrong with my 650 G2, or are they just not compatible?

405 G2, as well as all my other lenses fit fine.

The copper Aixiz module are build with tighter tolerances than the normal chrome module. Some G1/G2 lens don't fit in.
The solution is to swap just the lenses inside the barrel which fits the copper Aixiz module. You need a table as clean as possible and remember which side of the glass lens go in first.
I did it with a 3-lens glass barrel and the G2 lens barrel. Both barrel are metal and compartible.

or get a M9 x 0.5mm tap and go to town on it!