BenF said:
...time to fire a shot in the Dunlop vs. Schaller holy war...
Below are 3 reasons I stopped using Schallers, as always YMMV, and I'm certain most people use Schallers for a lifetime and never have an incident.
1. The nut always coming loose drove me stark raving crazy, if it takes loctite to secure the thing than Schaller should include a small tube of it in every package. As far as I'm concerned it's a design flaw. My truck can drive down 20 miles of rutted dirt road without losing its nuts.
2. The Schaller assembly is so small that I was able to pull them right through the strap hole. When attaching a Schaller to a strap I would always sew shut the vertical cut of the strap hole, leaving only the small hole for the Schaller post to go through. Once, while a friend of mine was extolling the virtues of Schallers, his strap pulled off the straplock and he just barely caught his guitar. He quickly said, "That only happens once and while, other than that, they're great!"
3. If the U-shapped channel is facing the floor (which many players seem to do), pulling on the release without a firm grip on the instrument means bye-bye bass. Odds of this ever happening to anyone is quite remote, but I'm a paranoid s.o.b.
I used Dunlops for somewhere in the 10-15 year period. I had a few incidents and, although I don't dislike the Dunlops, I believe the Schaller design is better.
To address your points:
1. You also need a pliers and a screwdriver to remove/replace the snap ring with Dunlops. Should that have to come with them?
2. There's supposed to be washers there. If the hole in your strap is too big for the washers- it's not the system's fault. That would be an operator headspace and timing issue.
3. The U-shaped cup should have the opening facing upward. Again, that would be an operator headspace and timing issue.
The redundancy in the Schaller design is evident in the 3rd point- if it's installed properly, even if one of the 2 locking mechanisms fails, the unit still works. If the spring loaded pin fails, the U shaped cup catches the instrument, if the cup fails... well the pin should be holding it in, and if you're using straplocks that are so beat that the metal cup breaks, it's your fault anyway.
With the Dunlop design, if the bearings fail, the male end comes out, the guitar drops. If the female end wears a groove onto the base of the male end, the male end "tilts" and the bearings can slip out of the track in the female end, and the guitar drops. In either case there's nothing to prevent the guitar from dropping if the primary mechanism fails.
In the past, I hated the Schaller design because I had the screw come undone- putting nail polish or loc-tite on the screw is just normal operater level maintenance.
Again, I don't exceptionally dislike Dunlops- just that in 16 or so years I've had at least 2 unexpected failures of
the system. With Schaller, I've had one failure, and that's because
"I" didn't make sure the nut was tight.
Edit: After reading this, I didn't mean to come off snotty- just addressing your valid points.