Originally Posted by 4stripes
The stock FW shroud doesn't surround the blade tips completely as the fan sits more forward than the FW fan. Efficiency will be compromised but it will "work".
Gluing isn't necessary, in fact I have tried both CA and PU with no improvement in failure rate (of the weaker fans). They still fail. If you have the newer stronger type, it should work without any glue but it will need dynamic balancing.
PS Why don't you simply cut the Changesun shroud to the length you want? I have done this for all my CS shrouds and is quite easy. using a hacksaw and sandpaper
Your explanation is a very large help for me.
I get my cs 12 from hobbyking tomorrow. I will cut the CS shroud when I can see that the CS shroud will fit in my Euro without to edit the foam.