A few days ago I learnt about this from RCGroups, and was curious why it wasn’t brought up earlier on this forum and DJI’s forum. So I’m putting this out. The Inspire 1 uses DJI’s E800 motors, and DJI are starting to sell the motors for people building their own multirotors. In the E800 manual, the motor bell and propellors have been designed to be self-locking (instead of ‘self-tightening’ which we know is bull). http://download.dji-innovations.com/downloads/e800/en/E800_User_Manual_v1.0_en.pdf This is the photo from the manual: Pure speculation on my part, but I think this is a much better long-term solution to slapping on plastic locks (which can get lost or possibily come off due to wear and damage of the plastic material). I think this will be on a future Inspire 1 revision at some point. If I was DJI, I would do the following additional to shipping propellor locks quickly so that customers can use their exisiting self-tightening props: 1. Ship customers a kit consisting of the motor mount, screws and four self-locking propellors (DJI model 1345s). 2. Offer to do the modification if the customer bring back the Inspire to retailer, distributor or DJI themselves. 3. If and when this new motor mount is implemented on the Inspire, clearly label the new model number so that future customers can identify them. I think the prop locks were a way for DJI to overcome the issue cheaply and quickly, but really they should really aim for a long-term solution and this locking prop design is a much better long-term solution. Going a step further will earn trust from their prospective customers.