The simple solution is to buy a different hand held fire extinguisher. My old hand held unit had a plastic removable pin with no seal or tamper proof indicator. As do all of the bottles in my house (kitchen, basement) and in my street car and tow vehicle. The plastic pin only prevents against accidental discharge. Tech should only care if the gauge on the bottle reads full, and if the bottle shows obvious signs of damage or discharge. Judging from the material, I would suspect that if I had forgetten to pull the pin, 'human adrenalin' would have been sufficient to squeeze the handle with the pin in place causing the pin to snap. Alternately, I could have replaced the pin with a wooden toothpick, thin thread, thin soldering wire, etc. My biggest concern with a hand held bottle is that they aren't designed for vibration with the pin removed, and I would be concerned that the bottle might go off on its own.
On the fire system in my prod car, we added a red piece of plastic tape to the safety pin to act like a 'remove before flight' flag. At the five minute mark, after I'm strapped in, the last thing we do is pull the pin. When I come off the track, the pin goes in.
I'm not worried about accidental discharge on the fire system.....you have to hit the pin pretty hard. Not likely to go off on its own. If it does go off it's my own damn fault.
