Update 1/4/2024
At the request of the Masked Marble, I've modified the original H-Pin so that it can be pushed horizontally rather than from above. Like their predecessors they pin together two adjacent Gravitrax Pro pillars. They can be used on the top or bottom of the pillar.
There are four variations: 24mm, 24.4mm, 24.5mm and 25mm.
In the 3Mf file there are three plates, Embossed, Plain and Reinforced. On the Reinforced plate I've provided the 24.4mm and 25.5mm versions.
Based on the feedback I've received the 24.4mm version appears to the best one.
I've eSun PLA+ in the photos as colour is quite close to Gravitrax's green and PLA+ wears a little better.