This is a washer replacement part for Fansproject WB001 Warbot Defender aka Springer's helicopter blades. I created this because I accidentally broke mine, so I hope that this is useful for anybody who is in a similar situation as I am. Tested and recommended material is WSF and Black Arcylic Detail, but it is possible that the washer may snap in half during installation if you order Black Arcylic Detail. As such, this kit includes four (4) of the same washer in case you break one so you can try again. Please order at your own risk, handle parts with care, and sand where needed. Handle slowly and with care when connecting and removing parts from toys to avoid damage.