angle u03b1 c1 is between about 150 u00b0 and about 175 u00b0 or equal to about 165 u00b0 and it is envisioned that second angle u03b1 c2 is between about 10 u00b0 and about 60 u00b0 or equal to about 30 u00b0 additionally foot 424 c is curved along its length e g its entire length it is envisioned that the curvature of foot 424 c is equal to or greater than the curvature of electrical contact rings 298 a and or slip ring 298 in this embodiment where the curvature of foot 424 c is greater than the curvature of electrical contact ring 298 a fig5 a an electrical connection is made at two locations u201c ec1 u201d and u201c ec2 u201d u2014 one where each foot 424 c contacts electrical contact ring 298 a in this embodiment the foot 424 c opens and conforms to ring 298 a maintaining multiple points of contact referring to fig5 a and 59b another embodiment of an electrical contact 420 d is shown electrical contact 420 d includes a yoke 422 d including two legs 424 d and a flexible contact 426 d spanning between legs 424 d each leg 424 d of yoke 422 d includes an opening 425 d configured to.