Micromanipulator, (3D pantograph), alternatives to commercial tools?

[Loft-full]

Has anyone come across a 3D pantograph tool that allows fine detailed work to be undertaken? The idea is that while your hand moves so far the end of the mechanism only travels a quarter of that distance. This might aid fine detail painting or placing of parts, and reduce the effect of any hand tremor.

There is a commercial offering. In fact it's the only one I've come across in recent years. It's a Singer Mk1 Micromanipulator. It's aimed at institutions and laboratories that work with microscopes. It's used by the biotech and microelectronic industries mostly.

This one seems to be very well designed and built, indeed it is a precision instrument meant for professional use.

http://www.singerinstruments.com/index.php?option=com_content&task=view&id=20&Itemid=516

................It costs £4,500. (2015 prices).

At the moment, I'm imagining prototypes made from loosely bolted lengths of Meccano.

Do you know of such a tool?