Have a good supply of replacement generators (vaporization tube) gaskets and pump cups. In my experience leather is the best because it rots less than rubber. In my opinion Pellgunoil (intended for air gun lubrication) is the best oil for anywhere on your lamp.
I personally have run kerosene for several years in my Coleman dual fuel (unleaded gasoline/Coleman fuel) lanterns, use this info at your own risk light is not as bright as the generator jet is optimized for gasoline/white-gas/Coleman fuel. Everclear/ethanol is good for cleaning out gunked generators, they can often be rebuilt. Coleman used to make a pin pricker tool for opening the jet orifice as well as unscrewing the generator, buy several wrap in foil and wire to the lantern. If running kerosene, diesel, or jet fuel in your lanterns (at your own risk) have a lighter or squirt bottle of alcohol to preheat the generator especially in very cold weather.
Most of this advice can be transferred to liquid fuel stoves.
You can make a replacement crystal from steel window screen. Proper sized jar can be etched and hot/cold cut if you break your lantern crystal.
Reinforce your mantle with a coil of steel wire anchored to the tubing or generator for longer life.- Anon.