uweh said..
how wide is the boomend inside north in cm ? thanks in advance
Sure. This was quicker to markup than explain in words, so a quick sketch is below :)
I also measured the boom diameters as follows (with a ruler but it felt reasonably accurate)...
Maui Sails carbon = 30mm with grip (quoted 30mm for 2016 website)
2016 North Platinum Aero = 29mm with grip (quoted 27.5mm)
2016 North Silver Slalom = 32mm with grip (quoted 30mm)
2016 North Red Slalom = 32mm with grip (quoted 30mm)
I think Maui Sails quote diameters with grip whilst North quote diameters without grip.
It is surprising that you can feel the 1mm difference between the Maui Sails 30mm and North 29mm.