Yes my typo had it set 10 times too small, had the decimal point wrong LOL
I am a bit confused however, a G0X2 should move 2mm not 25mm.
Do you definitely have your units set to mm? Look under the Config menu then at Select Native Units and see what it is, should be mm if you are going to use mm as your default. Also as RC said are you sure its a 24TPI screw as it would seem more logical for it to be metric if the OD is indeed 6mm.
Hood