A PRECISION DOUBLE ARM DRIVE

Picture 7

The wedge. The wedge is designed to be adjustable without tools. The long threaded shaft is 1/2" stainless steel and is threaded through the lower brass support. The brass jamb nut and thumb screws may be loosened for adjustment and polar alignment. The base of the wedge has a three inch diameter disc of nylatron (not visible) that fits the top plate of the surveyors tripod. Alignment is quick and easy. Note that this drive has the polar axis parallel with the wedge declination surface so the wedge is set up backwards compared to use with a polar mounted scope such as my ETX 60.


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