Nikon SB-600 Flashlight 77 mm Filter Adapter

Since ages I looked for a filter adapter enabling me to use filters at the flashlight., e.g. for infrared photography. Now I found the flash diffuser for my Nikon SB-600 flashlight so tightly fitting to the nikon flash that I decided to use this as one part of the filter adapter. The second part I just designed in Tinkercad from some rings and quaders. Part 2 has actually no thread for 77 mm filters, but the hole fits so fine that you can just clip the 77mm filter into the plastic. Works well w