First off, I have to admit that I have never done a zimmereit application on a model yet. But I have a Tiger I mid, and I have been looking for the best ways to apply it. I found a great way. I apologize for not knowing the website but, the guy who did the zimmereit used a peice of styrene cut to fit into the tip of a exacto knife handle. he cut the styrene to the perfect size for the zimmereit application, and not only was the tip the perfect size, he sanded the tip to an edge so it would not "squash out" like it does with a flat blade scew driver. I thought this model was the best one I had ever seen with zimmereit. After seeing it I decided to skip the expensive Photo-etch, and go the apply your own with milliput route.
-Jay-