Omron SS-5GL switches are often used to make "remove before flight" arming switches in rocketry, but a pin activated switch may well have other use cases. I've designed the switch case so that you mount the switch in place with the 2 supplied long M2 nuts and bolts and you can adjust the amount of friction the switch has against the pin. This means, using the standard "Pull Pin" model you can create a firm robust pull pin that is unlikely to drop out. If your project though requires a looser fit, for example a tripwire type application then you can set the switch and pin to have much lower friction. If that sounds a bit confusing check out the video below which walks through this product and how to set them up.

Each switch kit comes with the switch, the 3D printed case in orange PETG, and a 3mm mild steel pin around 80mm long. You can, of course, trim this down to whatever length you prefer. The pin heads are designed so that you can fit a lanyard thread through a hole on them, or you can use the pin head grooves for numerous approaches of securing the pin with rubber bands, again see the video below for more detail. You can of course replace the pin for any smooth 3mm rod.

Finally there are two options for this product, the standard Pull Pin model or the "Drop Pin" option. The drop pin option has a different case with an extended tunnel section on the release end. This is designed for systems where the pin remains attached to an object and the switch remains attached to a payload that falls away. For example a experimental parachute deployment system dropped from underneath a multirotor. Without the extended tunnel I found in testing that heavier payloads could cause the pin to skew at the last moment and occasionally bind on the exit hole of the case. This extended version has cured this and in extensive testing I've found that you need a payload with a minimum weight of around 40 grams to cleanly allow the payload to drop away from the retained pin.