Today I made sure all of the holes lined up and then drilled them bigger to screw in the small studs that I used earlier for the ring of light installation (I had lots of these small studs from the heatsink and didn't know a use for them before this). I then took them out after making sure everything fitted and put some JB weld in to secure them more firmly. The JB weld is now drying overnight. I also drilled 8 big holes for the big screw underneath the heatsink.