I've modified my nephews AEP but I've lost a spring,it's the one that holds down the firing selector (?) bar,without it it fires once then lifts up and wont fire until you puch the rod down,I've tried a biro spring mod to no avail because it jams it in full auto.It's very small and conical.I was wondering if anyone had one in their airsoft spares box that I could purchase.I've added a picture.TIA.It'll propbaly turn up in the shower or something...