Replacing the bulb is easy - once you get to it. Check the new kit - it will probably consist of the bulb itself, and a retainer ring. The old bulb is removed by simply ripping it out. The retaining ring is destroyed on removal, which is why you get a new one in the kit. Insert the new bulb, position the ring and drive it in with a socket (nozzle?) that just fits over the bulb. Takes a couple of minutes AFTER you take off all the parts to get to it!
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Phil Saunders, June 2009