Metal tube = great idea. If you really wanted to try something, you could cast the stalk with a "hollow" metal tube in it. Then you wouldn't have to worry about casting the wires directly into the stalk itself. Just string them through the hollow tube. Kill 2 birds with one stone if ya know what I mean. Some folks maybe have different ways of wiring up their RF lights. Mine uses 4 wires. THat way you could cater to everyone. Or maybe thats what the previous post were refering to when they said to put a metal rond into the stalk??? Dunno if it would actually work or not...just an idea.