1 redrocker 4 months ago I am (no kidding) posting for a friend — a tech question concerning his 1940s National lap steel he's in the process of selling. So, not a sale posting, a tech question. I figure if someone knows, it would be here. My pal John wrote:Sleuthing...I have a late-40s National lap steel that I never play. So I'm going to sell it. But it's got a totally whacked plug. I stumbled across this photo on Reverb, as I was pricing, and I've added BIG yellow arrows (I hope they're visible). Does anyone know what kind of jack this is called? I 'think' I have a working cable for the guitar (stashed somewhere), but I'm curious what this plug is called for the listing I'll create, when I post it for sale. The 'jack' next to the bottom arrow, apparently allows for a ¼" guitar jack to be used. Anyone know where I can find a jack like that? But first, the name for this particular plug. Anyone?