Audio Technica Sound Burger Headshell

This is a replacement headshell that's designed to mount a Nagaoka MP-110 onto the Sound Burger. The Audio Technica Sound Burger (AT-727) also known as the Mister Disc (AT-770) in some markets has a proprietary headshell that only accepts a single-screw mount cartridge. This should also work with the newly reissued AT-SB727 model. The MP-110 has a height of 18mm and this headshell should work with other cartridges in the same size range, like the Ortofon 2M series. The shaft of the model has room for adjustment if your cartridge is longer. I've also included an STL that should work with 14mm headshells which are more common in the Audio Technica/Rega world. If you use the STLs be sure to import the cut.stl as a negative object so you can adjust the position of the headshell.

Installation
No disassembly is required other than unplugging the four wires and unscrewing the headshell from the tonearm. You may find it easier to work on if you also remove the top of the shell, but it's not necessary. Be very careful when removing the existing wires because they are extremely thin and brittle. 

Tracking Force

You should also consider adding a few grams to the tonearm's counterweight because it's not adjustable and the new headshell plus the Nagaoka cartridge will give you a tracking force around 3.75 grams which is too heavy and slowly damage vinyl over time. Stick-on weights for golf clubs or pinewood derby cars work great. You can see where I've added them in the final picture.

Additional Setup

I recommend printing the AT727 Tonearm Rest by epsilon748 at 18mm z height and sticking some foam on the top of the case to make sure the tonearm stays secure without colliding with the taller headshell when closed.
 

Tuning 

Align using a Rega Stevenson arc protractor or something similar, and enjoy!