Bracelet replacement

A not very successful experiment to design and mill an adapter for an IWC 3701 wristwatch to replace the original modular bracelet (a module shown in one of the attached images) with some kind of strap to be attached to this adapter. I consider the experiment a fail because I used aluminum, but I was not able to find a piece of delrin, the material used originally for the modules, and the measurements were made using a caliper and a digital microscope so the result is not as accurate as it should.