Is it 'possible' with a Dremel? Yes, however, without a jig and guide, the finished product may not be as good as you would like. Using the old method of drilling your ends on a press, then cutting the connecting lines with the Dremel is the closest I can figure to pulling it off. Having said that, the cost in drill bits, and cutting wheels, cuss words, files, elbow grease etc, I think is a lot higher than having someone with the specialized tooling to do the job, not to mention, the actual time involved will be much less for them. They will also know better how the port should be properly positioned to not effect operation of the action.