Small Signal NPN Transistor, TO-92 KK254 Molex connector 2.54 mm spacing D 3 rotary switches are actually 2p6t, which means only six different step counts are available until the replacement arrives Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one cross-board wire is needed, vs 3 if the hole for mounting screw: ISO 1481-ST.