I have both the SG503 and SG504. You can get SG503's for cheap on Ebay. Also
SG504's... if they don't have the leveling head. The SG504 head uses a custom
ceramic hybrid detector (dual diode?) in the head (rough schematic in the SG504
manual available for download on BAMA). How about settling for a dual module
approach? Use the SG503 and design a detector head for the SG504 (the world
will acknowledge you greatness far and wide and buy you tasty cookies). I have
tried to build a leveling head with mixed (OK, piss poor) results but lost my
motivation when I stumbled upon a couple of heads that were in a "tool box"
plugin in a mainframe that I bought.
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