I chosed fiberglass because i hate rare materials,
it is my personal opinion but i think carbon fiber is a good material for structures but not for noise involved applications because of its damned loud sound.
the factory planes to do also a carbon fiber version,
but i just wish to see wich kind of person will be able to pay near two times the price to have something who works exactley like the fiberglass and deliveres an unceptable loud sound. and a "poser" carbon look like the S was racing the eurocup.
even my cooling plate is been done in carbonfiber just because in that moment i had that available material for free,
as soon as i can i will make another in fiberglass.
Talking about the locks,
mine is without spring,
i tested for 5.000 km just put it in position and nothing happened,
even if it move, ther is no place to go,
but if it really moves and lost its position it won't deliveres its 100% performances.
Basically it's supposed to be forced inside the hole in the front and the spring just have to cut vibrations.