When Premier ceased production Phil Brown of caving supplies bought all the tooling. He kept and still has the tooling for the cap lamps whilst he sold the tooling for the hand held lamps such as the king to "someone in Germany". From my point of view this was a bit of a problem as I was after reflectors for a couple of my kings. For some of my other lamps I have fabricated reflectors from th ebottom of old camping gas canisters, however I couldn't find one to fit the king. In 2007 I was in Clausthal in the Harz when I stumbled across a shop specialising in mining lamps. Much to my surprise the chap who owned the shop had bought the King tooling and I was able to buy several nice brass reflectors.
Helmet mounted "stinkies" can be tempramental beasts:
To get the best out of them make sure that you break the carbide up small enough - 10 - 20 mm dia lumps are good for small lamps.
Make sure that the O ring is sound - I once tried to use a split O ring by tightening the lamp up as far as it would go - when I sparked the thing up is was engulfed in flame, which my fellow explorers found highly diverting.
Don't trust the on board flint lighter, they are c**p - take a nice modern piezo fag lighter with you.
A pricker is essential, even with the best will in the world your jet will soot up.
Make sure that you have a good solid modern back up
light.
Using carbide lamps is an art, one that takes time to learn - good luck and have fun