Be careful when working with natural gas. Turn off the gas in the lantern while you are working to avoid burns and explosions.

1. First shut off the gas in the lantern. Find the valve, usually in the lower part of the lantern. It's usually a flat-head screw deep in a recess, accessible only with a regular slot-type screwdriver with a long shank. On most lanterns you will need to turn the valve clock-wise to the 3-o'clock position to turn off the gas. Let the lamp cool down a few minutes.
2. Remove a glass pane for access. Lift the glass about a quarter of an inch, then tilt the bottom out and carefully remove the pane. Now's a good time to remove all the glass panes and wash them.
3. Remove the old mantles. The mantles are attached to small ceramic rings which are hung from the gas nozzles of the lantern. The rings may be removed by lifting them about an eighth of an inch, then turning about sixth of a turn, and lowering. As you touch the assembly, the old mantle may disintegrate (that's okay).
4. Attach the old mantles. You may use various kinds of mantles, either those for camping lanterns or those specially-made for landscape lanterns, which have the mantle attached to an included ceramic ring. We recommend against the mantles with a metal clip, as these tend to have shorter lives.

   If you use camping lantern mantles with string ties, sit at a table and carefully position the mantle so that the drawstring tightens into the groove in the ceramic ring, space the slack in the mantle evenly around, and tie the drawstring.

   Hang the mantles-ring assemblies in reverse order of the removal process.

5. Replace all the glass panes but one.
6. Burn the new mantles before turning on the gas. Set a match or lighting stick to the new mantles until they fully burn, turn black, then turn white again.
7. Turn the gas on and immediately light the mantles. Adjust the gas flow.
8. Adjust the fuel-air mixture. If the flame does not behave properly, you may have to adjust the venturis. Somewhere along the gas feed tube inside the lantern you will find some small openings that allow air to mix with the natural gas. There should be a band of metal partially covering the openings. Use pliers to adjust the amount that the band covers the openings until the flame burns its best. The ideal gas lantern flame is white and confined entirely to the mantle.