I have been flying a 3s robotics solo for a while and went back to phantom. Got it out of the pack started it up...motors don't spin but shake. Look up issue on my phone and it's because I didn't install the prop guards and screws killed the motors. F ing bad design. Oh well...it's done... now gotta find new motors or just get new or used phantom 3. How easy is it to put in new motors? Looks like $90 will get me a set. Is it worth doing it?