Factory Adjusted Screw (Belt Calibration CrealityHi)

How about, I have a query with the X-axis strap adjustment on my creality hi + cfs … I’d like to start doing a full maintenance to my Creality Hi, but I bump that the back of the rail screw that drives the header X-Axis (and where the strap is) is super mega tight and can’t be unscrewed or loosened do the belt calibration, besides it’s as if the screw head had come “eaten/worn”. I wanted to loosen the screw with the Alem keys that come inside the Creality kit, but no way, also try with a professional kir that my parent has Alem keys … but honestly I don’t want to exert more force, I’m afraid to break the screw breaks, which would be the correct type of screw to replace in that area ?

I asked for help in customer support and still no eh received respues, besides I saw on the strap calibration Youtube videos that I usually use that screw, I bought the printer almost 8 months ago, but the first 2 months I hardly even use it and start using it quite these 3 months; so far it works wonderfully, I had some problems with the CFS, but nothing from the other world … Then I decided to do a maintenance on it in all respects, but I run into this hitch, someone know how to solve it.