This alone would be hard to come loose no matter the use, but there is more.the main area any loosening would start would be at mouth of tubing under repeated impacts, and it would take a lot of beating to distort the stainless thickwalled tubing.however, the blade has shoulders at start of tang, these shoulders rest on a guard made from 1/4' thick brass plate, and THEN the plate rests on the mouth of the tubing.total support against movement. The handle is 1' OD stainless tubing, with 1/8th' wall thickness X's 2, leaves a max of 3/4' ID.the tang is approx 1/4' thick and is pressed or beat into the tubing to degree tubing is distorted slightly top and bottom, leaving a max gap of 1/4' tapering to zero top and bottom of both sides.tang is approx 1 3/4' long. Let me tell you what i know by looking my early/mid 70's knife, about only difference today being the tang might be a bit shorter on newer. Very old thread, but also high on Google list for hits, the subject of Randall model 18 strength is something many are curious about.