The reason I am able to claim the precise control that I have achieved in my superwedge is because of the lateral support bearings fitted to the tangent arm. The declination control is no problem, it goes up and down with no backlash at all. In general the azimuth control is a problem to a greater or lesser extent depending upon the design of the tangent arm. On the Astroparts Superwedge tangent arm linkage, I have fitted bearings to support the peg which transmits the motion from the tangent arm to the baseplate of the wedge. These ensure a smooth gliding motion when the baseplate turns on top of the tripod, thus eliminating any tremor through the telescope. The result is that you can adjust the position of the Pole Star in your eyepiece as accurately as I have claimed.Back