I had a long weekend, so got around to installing a guardian, I have own a few guardian's but this was the first I self installed.. found out fast that the bores are 1 inch and are off set, so the side with groves is off center from the emitter section. I found a nice 24mm bass speaker to install courtesy of KRsabers and went with that instead of a 20mm.I also used a 1 inched standard blade plug from KRsabers too. I decided on a goth 3d chassis all in 1(sorry no picts) that uses 18650 keystone battery tray, and installed a Nbv4, I had to drill and tap for the 2.1 mm recharge port near the emitter, and I made a custom red switch using a left over red thumbscrew greebly with a shoulder( I have no Idea where I got it not tcss), but works great. i also installed a toggle switch and rumble motor.