Sprout at least 50 regular f1's of your strain, you should have at least 25 females , take 2 clones off every female while still in veg. tag and keep in veg room. Take the remaining females that you cut clones off and start stressing them with heat, light, humidity,cold. Make them unhappy. They will quikly turn herm, if they have that in their genetics. The ones that dont turn herm are your keepers and you have 2 copies in the veg room.