neg length springs are just what they are called, springs with a negative resting length, its technically a glitch but is mathimatically accurate, although physically impossible. you get them by saving a model locally and editing the value that is the spring's resting length(not its actual length), needless to say they have interesting properties like their ability to negate gravity or power certain things without muscles.
when i say resting length i mean the length the spring "rests" at, the point at which it is neither stretched out or squeezed together.
did i confuse you enough?
here's a diagram
1 and 2 are endpoints of a spring, ! and @ are their respective resting points
1---------2
!---@
this line's actual length is 9"-" but it's resting length is 3"-"
now a "neg length" spring
1---2
@---!
looking at the diagram it seems that the points swap, and yes that is exactly what they do, because as point1 attempts to move past point2, they swap places and their self generated momentum causes them to shrink from a length of 3, to 0, and back to 3 because this programs engine is stuck in a sort of a loop. no matter how much it attempts to shrink the line, it cannot generate a negative length to actually rest at.
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