Getting the parts
We have our favourite bricklink stores and we have arrangements with most of them for discounts. Most of the parts are not difficult to come by at all. However, there is a dark side to this story.
The pneumatic cylinders and the old style switches that we use are both not being produced anymore. And they are getting more expensive by the hour.
We buy pneumatic parts only in new condition, because this ensures the rubber seals are perfect, which allows for the optimum compression - no leaks.
We buy pneumatic parts anytime we can, and other parts according to demand.