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To insert the LEDs and the sockets I used following procedure: First I sticked the LED to the insertion part and soldered wires to the shortened pins. The solderings are insuleted by shrinking tubes and bent by 90° right above the insertion part. Then the wholt thing was pulled through the hole at the wires from the outside, until the LED sits right inside the hole (like it would later be hold by the socket). This is considerably easier then to fiddle the LED into the hole from the inside (if it would be possible to do so at all). Then the counter nut is slipped over the wires from th end until it rests on the rim of the hole. Next the socket is put into the hole from the outside. You have to take care that the insertion part doesn't cant because then the socket couldn't be pushed up far enough. The nut is screwed on with a screwdriver (there isn't enough room for a screw-wrench or tongs) while the socket is slowly pushed up. Finally the wires have to be soldered together. According to the LED's characteristics (U_F=3,8V; I_F=20mA) I soldered a 18Ω resistor into the wire. With this the three parallel LEDs can be safely operated at 5V.

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