A furniture jig comprises a frame member positioning portion and a spring stretcher portion with at least the positioning frame portion having a rotating feature. The positioning frame portion may surround the spring stretcher portion and comprises constraint members that define receiving regions, such as slots or channels, into which furniture components, such a box frame members, may be inserted. The receiving regions of the jig frame maintain the furniture components upright or in other useful orientations at least until they are affixed together. In embodiments, the spring stretcher has a plurality of spring receiving portions on which the ends of a spring can be releasably engaged. Support members extending from the spring receiving portions operate to move the spring receiving portions from a spring loading position in which the springs can positioned on the tips to a spring attachment position where the springs are securable to the frame members. Drive portions, such as pneumatic or hydraulic cylinders move the spring receiving portions and support members between the respective positions. A control processor can automate the motions and be activated by a pedal or other switch.