So I really like the r41, just wish it was a tad less aggressive at times, so I am going to try using the open comb head of the r41 with the cap from the de89. I took photos of both with a wilkinson sword blade for reference. You can see with the de 89 cap(on right) there is just a little less blade exposure but still plenty. It fit together very well....The angle of the blade did not look like it changed. The heads are very similar, a little steeper and wider on the de89. I will give it a test run tomorrow