Thanks for the responses guys. I found the answer. Both set screws are 1.5mm. I had to go to a couple of different places to track down individual 1.5mm hex keys without having to buy a complete set. Amazingly enough I found some at an Ace Hardware for $0.55. Both my CZ's (SPO1 and 97B) are converted to single action only, and now that I've tweaked the set screws a bit my triggers are sweet!!!!! I know I'm preaching to the choir on this web site, but my CZ's are amazing!!! Talk about target groups, these puppies have shot ragged holes since the day I took them new from their boxes! My SPO1 Tactical is the most accurate 9mm I've ever owned, and believe me, at one point or another, I've carried,tried, or owned them all. In my opinion, the SPO1 has no rival. Realiabilty, firepower, balance, feel etc... Did I mention cool looking?
Be Well Gentlemen.
"Yes, Yes, But what are you PREPARED to do?"
Sean Connery in "The Untouchables"