What is the youngest one should put a pup on a helper?

Ed,

I have one very quick question to ask you about. I know I can get other peoples input on your web board, but it's yours I interested in. You have been around the block many times, and I'm sure you also know a lot of other top level dog trainers that have as well, but when is the earliest a person should let their pup work with a helper? I have just about every one of your videos on this topic, and I think I know the right answer, be the reason I'm asking you is that there's a local ring sport trainer that thinks it should be right away. He is a ring three judge, and heads up a club that's very close to my home, so training with him would be nice. But he has some training methods that I'm not real pleased with like covering the eyes on a puppy that's about the same age as my pup, while it's doing basic rag bite work. And pushing down on it's nose at the same time. Ed I truly value you advice, and I want what's best for my pup.

Respectfully,
David

P. S. I know you don't have time to answer my every little question, but I need to know if these are good or bad signs in a club leader.