Thanks! That WOULD be nice, but I don't have that piece, (At least not in a MoC or set) and what would I do with the "Technic Bush"? Here's a gearbox design (from this MOC)that, if you add some 8-tooth gears and switch out the 3-length axles with 4-length+stop axles and bushings, works really well. I used a modified version of it on my Deflecto MOC (a MOC which I haven't posted here but soon will.) I think the design will work with the 12-tooth gears replacing the knob gears. EDIT: Also, the Mata head connection isn't that bad, in my opinion. It works with official Lego rubberbands, and so technically doesn't put the parts under pressure. I've used it myself, and it works pretty well. Credit to Jangbricks, because he invented it. If only I had more than 2 of those gears.... Thanks for finding the video. EDIT: What is the piece that the gearboxes use as gears? I've looked at Bricklink but to no avail. You mean the gears used in the new sets? They're the trusty old Technic Knob Wheel (as Bricklink calls it), dating back to the year 1998 and first appearing in Bionicle way back in 2002 (in the Boxor). Thank you! I forgot about the 2 on Black Phantom so I'll salvage those. Expect a new design when I finish sorting my pieces by color. EXTERMINATE!