It is best to give your variables some plain understandable names. Like in you function:( this is a spring with diameter and start and endpoint)

springmass[start_: 0, end_, diameter_] := 
 Module[{a = diameter, y1 = start, y2 = end, n = 100}, h = (y2 - y1)/n;
  yvalues = Table[k, {k, y1, y2, h}];
  xvalues = Table[a Sin[(m \[Pi])/2], {m, 0, n}];
  Line[Transpose[{xvalues, yvalues}]]]

This will then make a simple manipulate:

Manipulate[With[{size = .2},
  Animate[
   Graphics[{
     vspring[diameter, start, 2 Sin[y]],
     Red, Thickness[5 size], 
     Line[{{-.5 size, 2 Sin[y]}, {.5 size, 2 Sin[y]}}]}, 
    PlotRange -> {{-size, size}, {-2.2, 2 size}}, Axes -> True, 
    ImageSize -> Small],
   {y, -\[Pi], 0, 0.1}]],
 {{diameter, .2}, .05, 1},
 {{start, 0}, -1, 1}]

your function springs eliminates the strapping and considers it to be zero:springmass[start: 0, end, diameter_] := Module[{a = diameter, y1 = start, y2 = end, n = 100}, h = (y2 - y1)/n; yvalues = Table[k, {k, y1, y2, h}]; xvalues = Table[a Sin[(m [Pi])/2], {m, 0, n}]; Line[Transpose[{xvalues, yvalues}]]] This way no need for a third variable since the default value _:0 will be chosen.

Animate[Graphics[springmass[5 + Sin[\[CurlyPhi]], 1], 
  PlotRange -> {{-5, 5}, {0, 7}}, Axes -> True], {\[CurlyPhi], 0, 
  2 \[Pi]}]

It is better to explain the question more in detail since it was hard to guess what this was all about. But this will hopefully be of help.