Hi everyone, so I've been looking through the very helpful blog post here by Naoki:DIY Chip-on-board (COB) LEDs On DIY COBs, and I'd love to try putting a couple together as they are way cheaper than my current lights. The biggest problem for me is drilling the holes into the heatsink to attach the COB to it. My question is: do we have to drill holes? Would it work to just epoxy them or something similar? Thanks!