As the subject says, tried bigger numbers with no difference
1.7.9 #3092

Just to add a bit of info, it appears to use the stone as center and goes up and down equally, so the field extends below 0.
If the field extends below 0, could it add that amount on top, and vice versa for stone placed high?
Cheers

Ah right, damn sorry for being so late. Yes just use something like 512.

No worries :)

Thanks