If you receive ROBOTIME's products with missing parts or need to fix damaging/lost parts while assembling, don't worry! Here are 3 easy steps to apply for our part replacement service.   Step 1: click on the 'part replacement' page at the bottom of the Robotimeonline.com. or visit: https://www.robotimeonline.com/pages/part-replacement   Step 2: Click on the online form   Step 3: Fill out the form & submit Done! Our customer service will contact you via email within 2 working days.  NOTE: Due to the customs policy of international shipping, tools like glue, wax, and battery may not be included in the package. But don't worry, these tools can be easily found in your local stores. If you need help figuring out which specific glue or battery matches your kits or need further help, please feel free to contact our customer service team : service@robotime.com We've also put together DIY Help Center with answers to many common building and assembly questions. If you can't find what you're looking for there, or you need to request a replacement part, simply contact our customer support team and we'll be glad to assist you.