Polargraph Gondola - Uses coins for weight

I really like the design this is based on, but had to tweak a couple things for my own personal use.

I have been using coins as weights, so the first thing I did was added a pocket for coins on this gondola. This holds a little over $3.00 in coins, enough weight for my machine.

I also narrowed the neck on the pen holder and extended it. The original was too sloppy when I was using it with the pen lift.

I also reinforced the servo mount, the original seemed to flex a bit when the serv