[Elecraft] Questions about crystal replacement in K2 and SB board

[Todd Gahagan]

In the process of doing all the mods here (must be what its like to do brain
surgery on your own child) and have now reached the point where I need to
swap out the crystals.  Guess I'll risk showing my ignorance but wanted to
make sure that in the K2 this means replacing x5-x11 and not x3 and x4?
Also, replace all the crystals on the SSB board.  From what I can tell it
now looks like Elecraft recommends using two grounds for each crystal and
grounding them near the base??

One other question:  Why are we able to go to only one PLL crystal (X1)
instead of the original 2?

Thanks, Todd