The impeller on the cs65 is very small and doesn't leave a lot of room for much mesh.  I tried doing two layers of mesh on this and it just wouldn't work.  So I had to go with just one layer, there just didn't seem to be room for two layers.  I wasted a ton of mesh modding it till I got the right size.  On most needlewheels I would say that you should definitely remove the pins before modding, but on this one... I think you can get away without doing so as they are few and far between.