Interesting that you rejected the epoxies. Care to share why? I've been using the Arctic Silver epoxy to attach LDs to Al or Cu heatsinks. It seems to work fine, giving a good mechanical and thermal bond. It doesn't conduct electricity though.. is that the problem?I'm familiar with metal loaded epoxies, and rejected them a long time ago. I'm not after brute strength and heat tolerance, and it should be obvious from the kinds of stuff this forum is about, what properties I want this stuff for. Mainly, ease of getting stable optical/electronic structures with good heatsinking cheaply and without a lot of drilling and threading work.