If I recall correctly, Lile's hollow handle knives had a short tang that had 1/4" threads. The blade was from 1/4" stock and the tang was cut down to only 1/4" wide, rounded, then threaded. The handle tube had a plug at the front that had a matching 1/4" threaded hole. It was screwed onto the tang and sweat soldered in place in much the same manner as copper plumbing. You can figure the length of the tang by measuring the depth of the cavity in the handle, but I believe it was around 1" to 1 1/4" long.
David
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