For everyone that doesn't know Caspar Verhaagen a short description. He is a dedicated dutch windsurfing enthousiastic. I know him as someone that has done high quality research in windsurfing products. And his products are top of the line (like Caspar Speed fins). With his advice & knowledge he does help a lot dutch proriders, but also his articles in dutch magazines are populair for amateur sailors.
There are 2 comments on the NP X6 MXT extender (all sizes):
1) The knot problem
The knot in the extender can shoot out, through the metal. This happend in my case during a competition!! And I wasn't happy at all. Had to rig the sail again in the water...
- I use only the 8-knot, and that one doesn't slip through so far (50 sessions with NP RS Racing)
- Caspar drilled a little hole in the plastic on the MXT, and put the rope through that hole. Big advantage of this method is visability. (see picture, red spot is place of the hole)
2) MXT Adaptor
The adaptor to pin mastfoot systems is really dangerous. Maybe you have experienced, or else you will experience the mastfoot to eject from the extender DURING sailing.
I have experienced this with another system, and can guaranty you will crash hard, and on open water the chances of loosing your board is big.
Of course it is possible to fix this problem to with a pin-system, Caspar made his and a few other extenders safe, only this one you need a high acuracy. I won't recommend to do this at home. If you are intrested please comment or contact.
Best solution for most windsurfers is to use the Neilpryde Power M-Base, I use this one and it feels very safe. Main advantage of using NP Power M-base is that you can put the rope into the extender, no need to wind it around the extender, and never problems of rope comming loose from extender.