The original post was about getting just the safety pins to secure the l'Hotellier ball locking attachment, NOT the actual l'Hotellier fitting itself.
The tiny hairpins that go through the lock hole in the sliding ball retainer were the subject of the post.

In this case, any old pin will work- even a diaper safety pin, assuming there is enough clearance to keep it from hanging up on surrounding structure. (And you are old enough to remember what diaper safety pins are!) A twisted piece of safety wire through the lock hole in the spring-loaded sliding lock plate is a quick and dirty emergency fix, but an actual hairpin clip is better. Doesn't matter where it comes from- Walmart pins work just as well as Schempp-Hirth pins, and you can afford enough of them that you won't cry about dropping them inside the fuselage. But a piece of string can keep them from disappearing.

Another solution is to install Wedekind safety sleeves on the l"Hotellier ball lock fitting. They incorporate a spring loaded retractable sleeve that keeps the l'Hotellier lock plate from retracting, without the need for a safety pin. Easy one handed operation that can be accomplished by feel, and no risk of dropping stuff into the depths of the fuselage.

However, no matter what method you choose, give a healthy tug on the joint. It is not uncommon to THINK you have made a proper connection. only to discover at an inopportune moment that the seemingly proper connection was not, in fact, secure. Ask me how I know this. Fortunately, it was just a failure to connect one spoiler. Landing was a bit weird, but not traumatic like a failure to connect the elevator, or just one aileron, or one flap.