26 the narrowed transition area 34 of the central body 12 allows the wiper springs 20 to deflect when plugs are inserted into the jacks without hitting the central body this also provides clearance for the follower springs 18 and wiper springs 20 to be biased toward the central body the plug can then move the follower springs 18 and wiper springs 20 away from the central body causing firm continuous contact with the wiper springs 20 the posts 16 are cast as one unit with the midsection 14 each post has a conical shape which decreases in diameter slightly from the midsection 14 to the end of each post 16 referring now to fig2 and 5 at the attachment point between the midsection 14 and the post 16 a small depression 36 is cast into the midsection 14 to ensure that the first spring 18 or spacer 52 mounted on the posts 16 will rest flush against the midsection 14 the small depression also relieves any stress that may concentrate at the interface of posts 16 and midsection 14 the posts 16 preferably have a nearly constant diameter over a majority of their length so that components at a higher elevation in the stack will have only slightly more misalignment with respect to the posts than do those closer to the central body 12 some misalignment in a plane parallel to the midsection is tolerable so long as it does not interfere with the functioning of the follower springs 18 and wiper springs 20 when a plug is inserted all wiper springs 20 must of course remain aligned sufficiently to establish a connection with a plug upon insertion in jacks 28 the tip 38.