Elecraft PX3 Owner's Manual - Manual (Page 49)

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Assemble the front and rear covers as shown in Figure 43 and tighten the thumb screws only until snug. To
use the tilt feet, loosen the two rear thumb screws and swing the feet down, then retighten the thumb screws.
Always loosen the rear thumb screws completely before adjusting the tilt feet. Failing to do may
cause a thumbscrew to tighten as you move the foot, making it very hard to loosen later.
Figure 43. Assembling the Enclosure.
That completes the assembly of your PX3 Panadapter kit.