For the record, I have a Grizzly G1007, build date 6/04 that also has a .925-10 X leadscrew.
I suspect mine & the PDM30 are almost identical machines.
my adjustable X leadscrew nut looks like Brian’s in post #6.
I adjusted the nut with a 4mm allan on a long extension
years ago to remove some backlash.
I was afraid to tighten it any more.
it still has about 30 thou backlash, but isn’t any worse than a few yrs ago, I keep it well oiled.
I have DRO on all axis, so easy to live with.
I called Grizzly yrs ago, they weren’t sure which nut I had.
the leadscrew does not seem to have any wear, just the bronze nut.
if anyone has a part # for the adjustable bronze X nut
please post it.