Controlling the stamp tool

[unearthed]

When using the stamp tool I always find problems setting the level of the final surface position - is there some (unknown to me) way of controlling position using a key combination? The little up/down pair of arrows that come up always look so enticing but no amount of keying does anything...

[TIG]

Draw some guides or geometry off to one side at your desired z-height for the 'stamp'.
Make the stamp, approximating the z-height to that 'guide'.
Then edit the group containing the newly stamped form.
Select the stamped 'flat' footprint face[s].
Activate the Move tool...
With Shift held to constrain movement in the blue z-axis, snap to the guide/geom.
The flat parts will now be accurately located at that z-height.

[unearthed]

Thanks TIG, that worked perfectly.