Minor update on the HK silicone mod:

After letting it sit for a few days I took the block apart and found the
following:

- the silicon gasket is compressed to about 0.2mm (screws fully tightened)
- the 1st and the last channel is blocked by silicone ...this would result in no
or very little flow in these two chanells ...this might not occour in LT/Cu
block as it has very narrow channels (51 for LT/Cu vs. 34 for LC)
- at the ends of the top the silicone is very very compressed and might tear off

I then removed the silicone gasket and assembled the block as per default. With
screws fully tightened the top sits on the chanells ...I tried to insert a piece of
paper (~0.1mm thick) between the top and base and could not do it (not at the
center or at the sides ...the center of the top has a small bulge) .

NOTE: the above applies for the LC block, the silicone mod might affect the
LT/Cu block differently.