You can use an expensive one similar to the iFixit Model or you can find numerous cheaper alternatives on eBay. The best way to remove a key from an Apple Keyboard is with a Plastic Spudger. I wanted it fixed but knew nothing about repairing a keyboard key so I dived in, got my hands dirty and learned a few things. When I was doing a pass on the Wireless Keyboard I must have been a bit too rough and I broke the F10 Key, which provides the Mute On/Off Function, an important key in my opinion. So I went over it with a combo of Isopropyl Alcohol, Shellite and Mineral Turps depending on the toughness of cleaning required. This iMac was in very good condition, it just needed a solid clean to remove some stains and make it feel new again. Part of my process when I purchase any 2nd Hand Item is to give it a through once over when I get it. The 2nd Hand iMac came used from a facility that rents out Macs to University’s and then upgrades them for newer models down the line.
It wasn’t the newest and fastest setup but it was a significant step up for a reasonable price. I was upgrading my Mid-2009 24″ iMac that had been retrofitted with an SSD for a Late-2013 27″ iMac that came with a Wireless Keyboard and Magic Mouse as well and providing specs that trumped my current setup. I recently purchased a 2nd Hand iMac during the eBay 20% Off Tech Sale and managed to snatch up quite a good deal. If you wish to learn more about Apple Keyboards I suggest you take a look through this Wikipedia Article which gives you a very solid outline. The two keyboards that I will be dealing with in this discussions are as follows: Apple Wired Keyboard with Numeric Keypad (Model: A1243)