That's great it worked for you! I don't think it would work for me though. Whether I'm actively trying not to stutter or not even thinking about stuttering at all, I can randomly get really big blocks. It happened a few times when I was a kid too (I was fluent 99.99% of the time until the age of 15 but I remember a few instances of very sudden/strong blocks that I couldn't explain). I think there was clearly a neurological basis to mine, and I don't think I could convince myself otherwise!