Adjusting scrollbar width on Lubuntu

I recently updated my Lubuntu and noticed that the scrollbars are now nearly too thin to see. On a netbook, it's almost impossible. Fortunately, it's easy to fix.

UPDATE 28 Feb 2015: 
The prior method I listed no longer works as of Lubuntu 14.04, so use this method instead:

1. Run this command in a terminal (or just navigate with admin privileges to this directory)
   sudo leafpad /usr/share/themes/Lubuntu-default/gtk-2.0/gtkrc
2. In the document that opens, find the line entry for:
   GtkScrollbar            ::slider-width = 9
3. Replace the 9 with whatever number you want. I prefer a size of 20. 
4. Save the document
5. Logout and Log-in. Done. 

If you're curious, here's what a scrollbar size of "20" looks like on my desktop:

For history's sake, here are the older instructions, which no longer work:

1. Run this command in a terminal:
   sudo leafpad /usr/share/themes/Lubuntu-default/gtk-2.0/scrollbar.rc
2. Edit this line in the resulting document that pops up:
   GtkRange::slider-width = 20(replace "20" with your choice. 20 is a bit thick but that's how I like it. That's what she said)
3. Logout and Log-in again. Done.

Source: http://forum.lxde.org/viewtopic.php?f=8&t=31638#p48810