Luger Steel Lanyard 'Staple'

[sheepherder]

Originally Posted by Olle

Press fit (or "interference fit") is what the name implies: You press it in and the part is held in place by friction.

You can have an interference fit without pressing - Heat the hole and chill the pin. Let air cool. Half a thousandth o/s pin is adequate for this.

Swaging is best done with a rotating concave tool to heat up the pin end by friction while pressing down with your arbor or press. This makes a nice rounded dome that overlaps the sides of the hole.

My vote for the Luger loop is peened in place. A special holding fixture for the frame, stick the loop in the frame and place it in the fixture, lower a ram to touch the ends of the loop (inside the frame) then whack the ram with a BMFH...

Simple enough for slave labor and not time or machine intensive.

I use this method for re-assembling Buck 110 and 112 folding knives after I swap blades in them...

[DonVoigt]

I repeat what I said in post #15.
We have come full circle during this thread, and all said the same thing at least twice.

Bottom line is no one "knows" for sure; but I saw the countersink with my own eyes, so I'm convinced on at least one luger the staple ends were peened and then ground smooth.

[G.T.]

Sometimes, maybe most times, nothing is ever as it seems! Once a part like a lanyard ring is installed, it is probably never given a second thought buy the manufacture, as they come to realize, even the smallest amount of press fit, riveting, swaging or upsetting will far exceed the demands that the loop will ever be subject to? In essence, even a thousands of upset, will make the loop permanently locked in place...
I remember back in my first life as a boat motor mechanic, we had a 140 HP outboard throw a rod and it caused the flywheel to spin on the keyed taper crankshaft end?... We broke every puller we had, and then some we borrowed and the flywheel would not budge... We ended up at a Catapillar (sp.) dealership with one of the biggest pullers and a 1" impact wrench driving all home, with no apparent success... So, we just stood there and stared at the block/puller assembly on the tailgate of our shop truck. All of a sudden, BOOOOOM!!! .........The flywheel and puller blew off the block and flew a considerable distance up in the air... it seemed like a few feet, but was probably just enough to clear the crank, anyway, it was off and on the ground... As I inspected the flywheel and hardened crankshaft the key was sheared like butter, and the taper on the shaft had a barely visible upset ring of maybe one to three thousands high and looked like a scratch, and this held all those tons of force!!! It was not lost on me, how much weight even a thousands can hold... It certainly can hold a couple of pounds at the end of a flexible rope?...... best to all, til...lat'r....GT...

[cirelaw]

"Luger Jocks"