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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?

\usepackage{tikz, tikz-qtree, pgfplots}
\usetikzlibrary{arrows, decorations.markings, calc, fadings, decorations.pathreplacing, patterns, decorations.pathmorphing, positioning}


\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);
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closed as too localized by Qrrbrbirlbel, mafp, Martin Schröder, Kurt, Werner Jun 10 '13 at 22:27

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Go on sourceforge, download the two .new.code.tex files and put them in a place where LaTeX can find them (e.g. the same directory of your source code). Then add \usetikzlibrary{arrows.new} to your preamble and follow the doc (pgfmanual - new section.pdf or test.pdf). – Luigi Mar 29 '13 at 22:18
@Luigi so I will have to put these tex files in every folder then? I have different folders for different classes and I use tikz in every document in every class. – dustin Mar 29 '13 at 22:29
I'm sorry for the delay. You can put those files in your personal tree, so that LaTeX can always find them. I just made an example in the previous comment thinking it was the simplest thing to do for a quick test. Let me know if it's all right and keep in mind that it's an unofficial library at the moment. – Luigi Mar 30 '13 at 8:41
@dustin Any update? Could you use the arrows.new library? – Qrrbrbirlbel Jun 10 '13 at 22:02
@Qrrbrbirlbel everything works fine now. – dustin Jun 10 '13 at 22:11