I use the Schaller Straplock for several years. They are mounted on my Jazz Bass, Stratocaster and a Yamaha bass. I also installed these on a strat Straplock of 1981 and Squier, 1982. They are made in Germany.

In my case, I never had a problem with these straplocks. I never had any problems either with screws or a problem of wear etc. ...

On the practical side, these are very reliable straplocks, even if the system works well, the U shape that your guitar is kept (they are people who have installed the U upside: bravo les gas, it seems logical! !).
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Tip:</strong></span> - always keep your strap on your guitar, do not remove it ever like that, you avoid the "wear out" the system (if there's wear).

-Furthermore, before playing, make sure your Straplock are well covered, so, its save me hear some say that the strap loose. Do not be afraid, it is normal that any system, in time to deregulate (the case of your rope, handle, or straplocks of your brain).

-For the screws, re-use the screws that came with your instrument, what I did on my Jazz Bass, my Yamaha, my strat etc. ... it avoids many problems with the screws, the diameter of the holes etc. ...
For the price (about 12 €), the price / quality ratio is very good. Me, I'm happy, and without hesitation, I would buy.