I bought a Brother HL-2130 from Dick Smith. It's already whining about low toner. I was about to buy some on ebay. Then I noticed you can buy a cog and spring that is supposed to allow you to modify a starter toner cartridge into a normal one (so it takes more toner).
I picked up two empty (non-starter) toner cartridges from a Harvey Norman ink & toner recycling bin, so I could see where this cog and spring fits. But on my starter cartridge, there is no "axle" to fit a cog and spring - it looks like the lid off a spraycan but smaller (if you know what I mean).
Can I really fit the spring & cog to my starter cartridge!?
Try covering the sensor with electric tape.