Snaptain Issues

I only picked up 2 replacement motors which I used on the two rear wings. Given that the drone seems to tilt backwards and to one side I think it indicates a problem at the rear and not the front so I am not sure what I would gain from changing the two seemingly good front motors?
 
Tilt is normally lack of lift as these are smaller motors on the rear , I was thinking of all the motors are the same the lift should be more even with all 4 motors the same
 
sure i agree, but with two rear changed I'd expect the front to lift whilst the rear struggled as a whole. The fact that it is fighting on the back croner says to me that the back right wing is the problem, either it is not receiving enough power or there is physical damage.
 
So.... re-visiting this after a while with an update.

I gave up on my drone repair and bought another second-hand drone from eBay, same brand and similar model number. After a crash I started to experience the same issues with the new drone, poor lift on the back left motor. I took the affected drone wing apart and found that there was too much give on the prop shaftto the cog, I applied some force to push them together and the problem was resolved.

This gave me the idea to re-visit my original drone. Previously I had focused on the motors, but this time I took a close look at the prop shaft and it too had way too much play. Whilst trying to push down on the shaft to fully engage it with the cog, the cog came clean off and was too loose when I put it back on the prop shaft. I then had the idea of using a few dabs of Loc-tite to the prop shaft, left if for 10 mins to cure. Then a test-flight and it took off properly - nice and square and appears to be fixed!

Got there in the end - thanks for persisting with me.
 
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