Offset attachment device

1. An apparatus comprising:

a flange defining an upper surface and a lower surface;

an upper shaft projecting from the upper surface, centered about an upper longitudinal axis, and being cylindrical for its entire length with an exposed end face; and

a lower shaft projecting from the lower surface, centered about a lower longitudinal axis, and being cylindrical for its entire length with an exposed end face;

wherein the upper longitudinal axis is not collinear with the lower longitudinal axis.

2. The apparatus of claim 1 , wherein, with the upper shaft and the lower shaft oriented in a vertical direction, at least a portion of the upper shaft is vertically directly above a portion of the lower shaft.

3. The apparatus of claim 1 , wherein the upper shaft is cylindrical.

4. The apparatus of claim 1 , wherein the upper shaft is externally threaded.

5. The apparatus of claim 1 , wherein the upper shaft describes an unthreaded lateral surface.

6. The apparatus of claim 1 , wherein the flange is circular.

7. The apparatus of claim 1 , wherein the flange is polygonal.

8. An apparatus comprising:

a flange defining an upper surface and a lower surface;

an upper shaft projecting from the upper surface and centered about an upper longitudinal axis;

a lower shaft projecting from the lower surface and centered about a lower longitudinal axis, the lower longitudinal axis not collinear with the upper longitudinal axis; and

a through-hole passing through the upper shaft, the flange, and the lower shaft.

9. The apparatus of claim 8 , wherein the through-hole is at least partially smooth bored.

10. The apparatus of claim 8 , wherein the through-hole is at least partially internally threaded.

11. The apparatus of claim 8 , wherein the through-hole is linear along its entirety.

12. The apparatus of claim 8 , wherein the through-hole is centered in the upper shaft and off-center in the lower shaft.

13. The apparatus of claim 8 , wherein the through-hole describes an angled path in the flange that is not normal to the upper surface.

14. The apparatus of claim 8 , wherein the through-hole is linear along its entirety and describes an angled path in the upper shaft, the flange, and the lower shaft that is not normal to the upper surface.

15. The apparatus of claim 1 , wherein the upper shaft and the lower shaft have different diameters.

16. The apparatus of claim 1 , further comprising a blind internally-threaded hole in the upper shaft.

17. The apparatus of claim 1 , further comprising a socket or a slot in an end of the upper shaft opposite the flange.

18. The apparatus of claim 17 , wherein the socket or the slot is off-center in the end of the upper shaft opposite the flange.

19. The apparatus of claim 1 , further comprising a plurality of auxiliary holes passing through the flange.

20. An apparatus comprising:

a flange defining an upper surface and a lower surface;

an upper shaft projecting from the upper surface and centered about an upper longitudinal axis;

a lower shaft projecting from the lower surface and centered about a lower longitudinal axis;

a plurality of auxiliary holes passing through the flange;

a plurality of screws; and

a washer encircling the lower shaft;

wherein:

the upper longitudinal axis is not collinear with the lower longitudinal axis;

each of the plurality of auxiliary holes is at least partially internally threaded;

each of the plurality of screws threadably engages a respective one of the plurality of auxiliary holes;

the washer abuts the plurality of screws; and

a distance between the flange and the washer is determined by an extent by which the plurality of screws protrude from the flange towards the washer.

21. The apparatus of claim 1 , further comprising:

a first object attached to the upper shaft; and

a second object attached to the lower shaft;

wherein:

the upper shaft passes through or into the first object; and

the lower shaft passes through or into the second object.