Locate a medium-sized philips head screwdriver with at least a 2" straight shank, a flashlight and a new 15 watt bulb.
You will now remove the plastic end cap, exposing the lamp and socket. Raise the carrying handle and look in the slot/groove now exposed behind the left end of the handle . There is a hole/slot (ignore the smaller hole) in the plastic housing almost directly over where the bulb is located. Use your flashlight to locate the phillips crossed-slots in a black screw about a 1/2" below the hole/slot. Insert the screwdriver tip thru the hole/slot and rotate it until you feel it engage the screw head. Press down firmly and unscrew the screw several turns. The entire plastic end cap housing which covers the bulb and the needle mechanism will slide straight out and away from the main plastic frame.
You will be amazed to see the entire bulb and socket exposed. Looking down on the bulb, remove it by pushing it firmly upward and rotating it clockwise. Insert the new bulb by locating the guide grooves, inserting the bulb, then pushing it firmly upward and rotating it counter-clockwise to seat and lock it in place.
Unscrew the screw an additional few rotations so that that the washer under its head won't interfere with re-assembly. Gently replace the end cap so that the metal ears are under the screw and washer - retighten thru the hole/slot. Voila, a new bulb in less than two minutes . . .
Take this opportunity to oil the needle mechanism if you wish . . .
Bon chance . . . . . Dan