includes at least one flange member 160 integrated with the main portion 120 the at least one flange member 160 extends in a plane parallel to the pivot 122 the at least one flange member 160 includes a means such as a hole or threaded hole not shown to accept a threaded fastener used to pivotally secure a support shaft 170 in a preferred embodiment the main portion 120 of the clamp 110 includes a pair of spaced flanges 160 having aligned holes the support shaft 170 includes a flange 172 dimensioned to fit between the spaced flanges 160 the shaft flange 172 includes a hole not shown for aligning with the holes in that spaced flanges 160 so as to accept a threaded fastener to form a pivoting connection for the support shaft 170 relative to the clamp 110 the threaded fastener includes at last one hand engagable member such as a knurled knob 162 or a wing nut 164 to allow the position of the support shaft 170 to be adjusted by hand although illustrated with both it is clear that knob 162 could be replaced with other means such as a locking fastener head and that the wing nut 164 could be replaced with other means such as a threaded hole in one clamp flange 160 without departing from the scope of the present invention the support shaft 170 is preferably steel or a lightweight alloy and includes the above mentioned flange portion 172 and a sufficient length of a circular cross section portion 174 for mounting an aiming assembly 180 a significant portion of this circular cross section portion 174 is hollow for weight savings the aiming assembly 180 includes a clamping assembly 190 and an aiming device 182 for projecting an.