Drawing lines with an arrowhead

[Les2011]

Hi I am trying to generate a number line which can have either 1 or 2 arrowheads at the end of the line. Following is the code I use to do this but I cant seem to control the size of the head of the arrow without changing the thickness of the line?? Proportionately it does not look nice?? Is there some other tricks of the trade that you guys can suggest for me? I prefer to have a narrower line and a more obvious arrow head that preferable is not filled whereas the method I am currently using appears to not only not look good but the arrowhead is filled in also.

Thanks in advance,

Les

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