Some tips i found by researching on my own and watching the video ratrig how to get a square frame

i now fighted days for getting my bed to an exceptable shape what the video says is that you mainly shall focus on the two gentry rails - thats correct. but when i tried his tips i could only get some very little improvements. then i removed all the clamps on the top side to see how big this differences where (on both sides) see picture … and what shall i say - the bed was much better. so fastening all this stuff too hard is influencing the bed. so next i will try to fix the rest and hope that this will improve the missing 0.1 as i think 0.2 for a 500 rat should be good enough.