I received a call today from Jim Adamson at Kaltech regarding modifications to shielding block TSH0225.

They had finished removing 19mm from the bottom of the block, as well as removing 10mm of material from the side plates (TSH0246).  He was wondering whether it was also necessary to remove material from the back plate (TSH0253) and weld the back plate to the 6" plate (TSH0252).  I instructed him that it is not necessary to machine and weld the back plate.  This decision is based on weld strength calculations I performed last week which showed that the existing welds are much stronger than what is required to take the load applied when lifting the block (FOS >> 10)