What brand and model holder are you using in your machine? I downloaded this file right from the vendors website Metric hydralic holder.
The tool holder it self really doesn't matter. By that I mean if you are doing gouge checking against the tool holder as long as the outside dimensions match what you are using the tool holder assembly really can be anything you assemble. The tool and holder are assembled on the center axis and face of the tool holder. So you can take a cat 40 er32 collet chuck with a 1/2 inch collet and assemble your 3 mm end mill in that and it will still work for what you are doing. Even solid tool holders if you take an 1/8 inch end mill holder and assemble your 3mm end mill it will work as long as the outside dimensions are close.
hope this makes sense to you,