Following the videos and manual i started to take apart the head to add thread lock and lube and there here we go 5 min in the build and i cannot loose 2 screws. Now it seems that the alan screw head stripped , 1.5,mm key is loose and 2mm is to big.
A metal epoxy & a throw away conventional allen key, works quite well for the smaller or 'difficult to get to' ones. Needs to be left over night though for the epoxy to cure and harden thoroughly.