# Specialty tools ## Propeller balancing equipment The propellers coming with the HoverGames kit (the same as provided in the links above) can sometimes have balancing issues: one blade can be heavier than the other, which could cause unwanted vibrations. This inbalance can be removed by adding or removing weight from one of the propeller blades (sticking tape underneath the blade or by sanding it down). To check the balance of a propeller, you can use special propeller balancing tools, which can show you whether one of the propeller blades is heavier than the other. Some people have used very basic setups, such as an iron nail. Others have used dedicated propeller balancer shafts such as the one linked below. {% embed url="" %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://nxp.gitbook.io/hovergames/userguide/replacement-parts-alternatives-and-upgrades/specialty-tools.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.