I've estimated max possible angle of incidence on TT if we allow 20mm tolerance for the beam size and 5 mm tolerance for spot location on the mirror. It turns out to be
alpha = 43 degrees
So we need to cut the central part of the bracket. Then the max possible angle of incidence will be
alpha = 63 degrees

We can start the vent on Monday and use TT with an old bracket for yaw damping and later during the week we can install the brackets after they will be baked. |