Making arrow heads smaller using "arrowsnew"

Question

I want to make the arrowheads smaller on the $\delta v_A$ arrow and on the [<->] arrows.

I made the file from this post

Is it possible to change the size of an arrowhead in TikZ/PGF?

but it didn't work. I added \input{arrowsnew} to the preamble and everything.

So, how can I make the arrow heads smaller?

\documentclass[11pt]{article}
\usepackage{tikz, tikz-qtree, pgfplots}
\pgfplotsset{compat=1.7} 
\usetikzlibrary{arrows, decorations.markings, calc, fadings, decorations.pathreplacing, patterns, decorations.pathmorphing, positioning}

\begin{document}

\begin{tikzpicture}[line join = round, line cap = round, >=triangle 45]
  \draw[dashdotted] (3.5,0) -- (-5,0);
    \filldraw[top color = green!75!blue, bottom color = blue!40!green] (0,0) circle (.15cm);
      \begin{scope}[decoration = {markings, mark = at position 0.265 with {\arrow{>}},} ]
        \draw[postaction = decorate] (0,0) circle (1cm);
        \node[draw, circle, fill = white, inner sep = .08cm, scale = .75]
        at (-.173648,-.984808) {1};
        \filldraw[black] (1,0) circle (.05cm);
        \draw[->] (1.2,-.25) -- (1.2,.5) node[above, scale = .75] {$\Delta v_A$};
        \draw[<->] (-.106066,.106066) -- (-.707107,.707107);
      \end{scope}
    \end{tikzpicture}
\end{document}