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.