Hi michael65,
I have spoken with our supplier and half-way along the centre of the hinge (knuckle) there is what looks like a grub screw with a hexagonal socket for an Allen key. This is not a grub screw, it is in fact a roll-pin pushed in place to secure the knuckle (and so one of the hinge leaves) to the hinge pin. No Allen keys are required for this hinge.
Thanks for using Screwfix Q&A. JT
Answered by: JTremain
Date published: 2019-04-06