Today was the first time my new T300's made it out to the course. Great irons overall. However, on the 18th tee, I noticed a rattle coming from the head of my 4 iron. Looking into the back cavity, didn't notice anything missing or loose, but you could definitely hear it. I waited 5 weeks for these custom clubs to arrive and fear I'll now be waiting another 5 weeks to get a replacement 4 iron. Anyone experience something like this with the new T300s?