Thanks..

One of the reasons I made the mounting thread (M4) out of aluminum is that if you do knock it and bend it hopefully it will not damage the nose section. If I had bored out and tapped and put a M4 setscrew in to the end of the probe, I believe you would see more damage to nose if someone walked in to it. If anyone does knock the probes and breaks off the M4 thread I can bore out and tap and install a new mounting thread by loctiting a new setscrew made out of aluminum

Alan