slate
Thank you sir
Look, in most cases there's othing wrong with the Brunstone. If it's crowned or sway back, then that may also indicate there's a problem with the frame. If the long timber frames have bowed downward over time from improper shimming of the slates, then when you mount the slate it may in fact be flat level, but once you screw mount it to the frame of the table, you may in fact be pulling down both sides of the slate across the frame making the slate appear to be crowned or vice versa. I haven't ran across enough bad brunstone to even worry about it.
Thank you sir