Squeaking coming from the Thruster mechanism is common and can be solved easily in a few seconds. The squeaking is not dangerous or damaging to your SmoothStar so there is no need to be worried!
Unfortunately, we cannot provide this oil with purchase due to the long distance it must travel to get to customers. Imagine if oil was everywhere inside the box!
To fix this problem, tip the board on its side and apply a little lubricant on the front and end of the spring inside the Thruster. Please use machine oil or sewing machine oil which is readily available in hardware stores. Don't use WD-40 as it is too light to lubricate this part effectively.