I wrote on Coupechouxclub if this is a hard stone i didnt meant a "heavy stone"
bad translater :-)
If so my Vote is CF...this is no Swedenstein iam 100% shure here is the Swedenstein...
@Vasillis: great you used that Video from my Channel i really appreciate it, thats for what these Videos are meant to use for !!
https://farm8.staticflickr.com/7419/...d8fa8e_c_d.jpg