welding

Hiya, looking for some input, advice/suggestions and general pointers in the right direction. I am a pretty decent tig welder and after ordering a couple various steel customs I decided I just want to make my own... My two biggest things. How on earth would I create the "stealth lock" holding...

I purchased a Steel Worxx Looker 2 a few years ago. When I got a piercing I sent it back for modifications. I was never happy with the finished result. I'd made an error with the measurements and it didn't fit quite right after that. I then bought a lock to replace the integrated security screw...