Some may believe the Schurter type selector switch to be the standard, I prefer screw type arming switches... I started out using twist and tape, (L-3 done with twist & tape), and moved on to high quality slide switches, key switches, push-push switches and just about every other type switch that I believed would work...
The reason I changed to switches: I was using a Transolve P-2 altimeter using twist & tape... During one prelaunch arming process I experienced both apogee & main charges firing during that arming process... After that big surprise, and doing a bench check of the unit that ops checked good, I had a conversation with John Fliesher... That is when he explained to me about how some altimeters, (his in particular), were susceptible to switch bounce and; how twist & tape if not done carefully, could cause switch bounce and also why he recommended using a good quality switch... The reasoning for this and why switch bounce would be a problem, is that barometric altimeters in particular require re-initialization after the power circuit is broken, in this case, more than likely by switch bounce... If the period of time is to short between power off and re powering up, there is still voltage available in the storage capacitor, etc. During the re-initializing system check, one of the processes is to check for the presence and continuity of electric matches in the circuit. If there is still sufficient voltage/current remaining because not enough time has passed between power off and re-power up, that residual voltage is immediately applied to the apogee and main charge in sequence... Boom-Boom out goes the lights! For those of you that have never had the experience of standing on a ladder next to a 50 lb. rocket when two 5 + gram charges fire in immediate sequence, it is a few seconds of terror, until you realize all your parts are still attached and you can clime off the ladder or pick yourself up from the ground, all in one piece...:eyepop:
For me, I now use switches exclusively, screw type arming switches in particular or in a pinch a good quality DPST/DPDT switch ganged together... Your mileage may vary...:2:
As a TAP member I would caution but not disapprove the use of "twist and tape"...