If this problem is still happening, then it has not been discussed enough. Once spare parts become available to everyone, then it will go away once and for all. Until then, its "the squeaky wheel gets the oil" approach of getting what you need from a manufacturer. In a normal retail environment, this should not be necessary if the company involved has good reputation for integrity and after the sale support for their customers.
I can understand that 2box needs to get their production in line with customer demand, however they also have a responsibility to their current customers and need to support their needs as well. What we are requesting is not unreasonable and it would not even be necessary, if they would supply the correct amount of cymbal pads to begin with. So as far as I am concerned, being a little more patient will not yield any favorable results, especially if the company in question is mainly concerned with future sales only! Besides, were do you draw the line with "being patient", after 1 year, 3 years, 5 years or when the extra parts are no longer available because the next model has been released???