Create MBR on a USB stick for booting F18 on /dev/sda3

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http://www.linuxquestions.org – Background: It is a dual boot machine with F18 installed on /dev/sda3. In order to boot F18, I have created (during F18 installation) an MBR on a USB stick. So now when I insert the USB stick, my laptop boots F18 system (otherwise it boots Win7). MBR on HDD boots only Win7 and I do not want to touch or modify it. I have a good reason for that, which I do not want to discuss here. Problem description: Yesterday I lost my USB stick. Without USB stick I can't boot F18... Question: How can I (re)create MBR on another USB stick (without having to reinstall F18) that will point to /dev/sda3 as t (HowTos)