I'm going to sound like book ( member ) right now . Slow Down . Your moving to fast and learning very little as you go . And Yes . There's DDOs for both Copper & Zinc . Carry On ...................
As paddyman98 said DDD or MD a new pic isn't going to change it, but keep looking they are out there. Dave
That's good solid advice, Rick. And to respectfully add to it.... http://doubleddie.com/144801.html Considering one is much more likely to encounter "worthless doubling", it only makes sense to familiarize oneself with the types they're, well, likely to encounter.